21121152361311 has 16 divisors (see below), whose sum is σ = 28296746694144. Its totient is φ = 14013262485504.

The previous prime is 21121152361247. The next prime is 21121152361321. The reversal of 21121152361311 is 11316325112112.

It is not a de Polignac number, because 21121152361311 - 2⁶ = 21121152361247 is a prime.

It is a super-2 number, since 2×21121152361311² (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 (21121152361321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11567761 + ... + 13268586.

It is an arithmetic number, because the mean of its divisors is an integer number (1768546668384).

Almost surely, 2^{21121152361311} is an apocalyptic number.

21121152361311 is a deficient number, since it is larger than the sum of its proper divisors (7175594332833).

21121152361311 is a wasteful number, since it uses less digits than its factorization.

21121152361311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24837710.

The product of its digits is 2160, while the sum is 30.

Adding to 21121152361311 its reverse (11316325112112), we get a palindrome (32437477473423).

The spelling of 21121152361311 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred fifty-two million, three hundred sixty-one thousand, three hundred eleven".