21214232663502 has 16 divisors (see below), whose sum is σ = 42428512577232. Its totient is φ = 7071403012800.

The previous prime is 21214232663479. The next prime is 21214232663509. The reversal of 21214232663502 is 20536623241212.

It is a super-2 number, since 2×21214232663502² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21214232663509) 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, 7036348 + ... + 9588464.

It is an arithmetic number, because the mean of its divisors is an integer number (2651782036077).

Almost surely, 2^{21214232663502} is an apocalyptic number.

21214232663502 is an abundant number, since it is smaller than the sum of its proper divisors (21214279913730).

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

21214232663502 is a wasteful number, since it uses less digits than its factorization.

21214232663502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3937523.

The product of its (nonzero) digits is 207360, while the sum is 39.

The spelling of 21214232663502 in words is "twenty-one trillion, two hundred fourteen billion, two hundred thirty-two million, six hundred sixty-three thousand, five hundred two".