21214041331656 has 16 divisors (see below), whose sum is σ = 53035103329200. Its totient is φ = 7071347110544.

The previous prime is 21214041331643. The next prime is 21214041331657. The reversal of 21214041331656 is 65613314041212.

It is not an unprimeable number, because it can be changed into a prime (21214041331657) 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, 441959194386 + ... + 441959194433.

It is an arithmetic number, because the mean of its divisors is an integer number (3314693958075).

Almost surely, 2^{21214041331656} is an apocalyptic number.

It is an amenable number.

21214041331656 is an abundant number, since it is smaller than the sum of its proper divisors (31821061997544).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21214041331656 is a wasteful number, since it uses less digits than its factorization.

21214041331656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 883918388828 (or 883918388824 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 39.

Adding to 21214041331656 its reverse (65613314041212), we get a palindrome (86827355372868).

The spelling of 21214041331656 in words is "twenty-one trillion, two hundred fourteen billion, forty-one million, three hundred thirty-one thousand, six hundred fifty-six".