21211514355231 has 48 divisors (see below), whose sum is σ = 34092763065504. Its totient is φ = 12648326971392.

The previous prime is 21211514355221. The next prime is 21211514355247. The reversal of 21211514355231 is 13255341511212.

21211514355231 is a `hidden beast` number, since 2 + 1 + 2 + 11 + 51 + 43 + 552 + 3 + 1 = 666.

It is not a de Polignac number, because 21211514355231 - 2⁷ = 21211514355103 is a prime.

It is a super-2 number, since 2×21211514355231² (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 (21211514355221) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 43325826 + ... + 43812671.

It is an arithmetic number, because the mean of its divisors is an integer number (710265897198).

Almost surely, 2^{21211514355231} is an apocalyptic number.

21211514355231 is a deficient number, since it is larger than the sum of its proper divisors (12881248710273).

21211514355231 is a wasteful number, since it uses less digits than its factorization.

21211514355231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87138600 (or 87138597 counting only the distinct ones).

The product of its digits is 36000, while the sum is 36.

Adding to 21211514355231 its reverse (13255341511212), we get a palindrome (34466855866443).

The spelling of 21211514355231 in words is "twenty-one trillion, two hundred eleven billion, five hundred fourteen million, three hundred fifty-five thousand, two hundred thirty-one".