12420543032251 has 32 divisors (see below), whose sum is σ = 13217007513600. Its totient is φ = 11649667276800.

The previous prime is 12420543032101. The next prime is 12420543032281. The reversal of 12420543032251 is 15223034502421.

It is a cyclic number.

It is not a de Polignac number, because 12420543032251 - 2⁴³ = 3624450010043 is a prime.

It is a super-2 number, since 2×12420543032251² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12420543032281) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2197156741 + ... + 2197162393.

It is an arithmetic number, because the mean of its divisors is an integer number (413031484800).

Almost surely, 2^{12420543032251} is an apocalyptic number.

12420543032251 is a deficient number, since it is larger than the sum of its proper divisors (796464481349).

12420543032251 is a wasteful number, since it uses less digits than its factorization.

12420543032251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8599.

The product of its (nonzero) digits is 57600, while the sum is 34.

Adding to 12420543032251 its reverse (15223034502421), we get a palindrome (27643577534672).

The spelling of 12420543032251 in words is "twelve trillion, four hundred twenty billion, five hundred forty-three million, thirty-two thousand, two hundred fifty-one".