1231002421 has 4 divisors (see below), whose sum is σ = 1342911744. Its totient is φ = 1119093100.

The previous prime is 1231002413. The next prime is 1231002497. The reversal of 1231002421 is 1242001321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1231002421 - 2³ = 1231002413 is a prime.

It is a super-2 number, since 2×1231002421² = 3030733921015722482, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1231002395 and 1231002404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231002821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55954645 + ... + 55954666.

It is an arithmetic number, because the mean of its divisors is an integer number (335727936).

Almost surely, 2^1231002421 is an apocalyptic number.

1231002421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1231002421 is a deficient number, since it is larger than the sum of its proper divisors (111909323).

1231002421 is a wasteful number, since it uses less digits than its factorization.

1231002421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111909322.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 1231002421 is about 35085.6440870052. The cubic root of 1231002421 is about 1071.7322571135.

Adding to 1231002421 its reverse (1242001321), we get a palindrome (2473003742).

It can be divided in two parts, 123100 and 2421, that added together give a palindrome (125521).

The spelling of 1231002421 in words is "one billion, two hundred thirty-one million, two thousand, four hundred twenty-one".