21160630821 has 32 divisors (see below), whose sum is σ = 32202501120. Its totient is φ = 12234499200.

The previous prime is 21160630769. The next prime is 21160630831. The reversal of 21160630821 is 12803606112.

It is not a de Polignac number, because 21160630821 - 2²³ = 21152242213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21160630831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 250881 + ... + 324441.

It is an arithmetic number, because the mean of its divisors is an integer number (1006328160).

Almost surely, 2^21160630821 is an apocalyptic number.

It is an amenable number.

21160630821 is a deficient number, since it is larger than the sum of its proper divisors (11041870299).

21160630821 is a wasteful number, since it uses less digits than its factorization.

21160630821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73977.

The product of its (nonzero) digits is 3456, while the sum is 30.

The spelling of 21160630821 in words is "twenty-one billion, one hundred sixty million, six hundred thirty thousand, eight hundred twenty-one".