21051113331 has 16 divisors (see below), whose sum is σ = 29659253760. Its totient is φ = 13253972160.

The previous prime is 21051113297. The next prime is 21051113351. The reversal of 21051113331 is 13331115012.

It is not a de Polignac number, because 21051113331 - 2¹⁰ = 21051112307 is a prime.

It is a super-2 number, since 2×21051113331² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21051113298 and 21051113307.

It is not an unprimeable number, because it can be changed into a prime (21051113351) 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, 1925490 + ... + 1936391.

It is an arithmetic number, because the mean of its divisors is an integer number (1853703360).

Almost surely, 2^21051113331 is an apocalyptic number.

21051113331 is a deficient number, since it is larger than the sum of its proper divisors (8608140429).

21051113331 is a wasteful number, since it uses less digits than its factorization.

21051113331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3861986.

The product of its (nonzero) digits is 270, while the sum is 21.

Adding to 21051113331 its reverse (13331115012), we get a palindrome (34382228343).

The spelling of 21051113331 in words is "twenty-one billion, fifty-one million, one hundred thirteen thousand, three hundred thirty-one".