156871025421 has 32 divisors (see below), whose sum is σ = 240267962880. Its totient is φ = 90038491200.

The previous prime is 156871025417. The next prime is 156871025431. The reversal of 156871025421 is 124520178651.

It is a happy number.

It is not a de Polignac number, because 156871025421 - 2² = 156871025417 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (156871025431) 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, 1846351 + ... + 1929443.

It is an arithmetic number, because the mean of its divisors is an integer number (7508373840).

Almost surely, 2^156871025421 is an apocalyptic number.

156871025421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

156871025421 is a deficient number, since it is larger than the sum of its proper divisors (83396937459).

156871025421 is a wasteful number, since it uses less digits than its factorization.

156871025421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86137.

The product of its (nonzero) digits is 134400, while the sum is 42.

The spelling of 156871025421 in words is "one hundred fifty-six billion, eight hundred seventy-one million, twenty-five thousand, four hundred twenty-one".