1231420005021 has 8 divisors (see below), whose sum is σ = 1652766806464. Its totient is φ = 815509936800.

The previous prime is 1231420005007. The next prime is 1231420005041. The reversal of 1231420005021 is 1205000241321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1231420005021 - 2⁵ = 1231420004989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231420005041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1359182776 + ... + 1359183681.

It is an arithmetic number, because the mean of its divisors is an integer number (206595850808).

Almost surely, 2^{1231420005021} is an apocalyptic number.

It is an amenable number.

1231420005021 is a deficient number, since it is larger than the sum of its proper divisors (421346801443).

1231420005021 is a wasteful number, since it uses less digits than its factorization.

1231420005021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2718366611.

The product of its (nonzero) digits is 480, while the sum is 21.

Adding to 1231420005021 its reverse (1205000241321), we get a palindrome (2436420246342).

The spelling of 1231420005021 in words is "one trillion, two hundred thirty-one billion, four hundred twenty million, five thousand, twenty-one".