1012400421 has 4 divisors (see below), whose sum is σ = 1349867232. Its totient is φ = 674933612.

The previous prime is 1012400383. The next prime is 1012400423. The reversal of 1012400421 is 1240042101.

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 1012400421 - 2¹⁰ = 1012399397 is a prime.

It is a super-2 number, since 2×1012400421² = 2049909224881954482, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1012400421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1012400423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168733401 + ... + 168733406.

It is an arithmetic number, because the mean of its divisors is an integer number (337466808).

Almost surely, 2^1012400421 is an apocalyptic number.

It is an amenable number.

1012400421 is a deficient number, since it is larger than the sum of its proper divisors (337466811).

1012400421 is an equidigital number, since it uses as much as digits as its factorization.

1012400421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337466810.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 1012400421 is about 31818.2403818942. The cubic root of 1012400421 is about 1004.1165048026.

Adding to 1012400421 its reverse (1240042101), we get a palindrome (2252442522).

The spelling of 1012400421 in words is "one billion, twelve million, four hundred thousand, four hundred twenty-one".