21113137461 has 16 divisors (see below), whose sum is σ = 30491548416. Its totient is φ = 12917593536.

The previous prime is 21113137447. The next prime is 21113137483. The reversal of 21113137461 is 16473131112.

It is not a de Polignac number, because 21113137461 - 2⁷ = 21113137333 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113137361) 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, 1557885 + ... + 1571378.

It is an arithmetic number, because the mean of its divisors is an integer number (1905721776).

Almost surely, 2^21113137461 is an apocalyptic number.

It is an amenable number.

21113137461 is a deficient number, since it is larger than the sum of its proper divisors (9378410955).

21113137461 is a wasteful number, since it uses less digits than its factorization.

21113137461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3129452.

The product of its digits is 3024, while the sum is 30.

Adding to 21113137461 its reverse (16473131112), we get a palindrome (37586268573).

The spelling of 21113137461 in words is "twenty-one billion, one hundred thirteen million, one hundred thirty-seven thousand, four hundred sixty-one".