21492513061 has 4 divisors (see below), whose sum is σ = 21621210912. Its totient is φ = 21363815212.

The previous prime is 21492513037. The next prime is 21492513067. The reversal of 21492513061 is 16031529412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21492513061 - 2¹¹ = 21492511013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21492513067) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64348675 + ... + 64349008.

It is an arithmetic number, because the mean of its divisors is an integer number (5405302728).

Almost surely, 2^21492513061 is an apocalyptic number.

It is an amenable number.

21492513061 is a deficient number, since it is larger than the sum of its proper divisors (128697851).

21492513061 is a wasteful number, since it uses less digits than its factorization.

21492513061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128697850.

The product of its (nonzero) digits is 12960, while the sum is 34.

The spelling of 21492513061 in words is "twenty-one billion, four hundred ninety-two million, five hundred thirteen thousand, sixty-one".