21162973061 has 8 divisors (see below), whose sum is σ = 21242511360. Its totient is φ = 21083485072.

The previous prime is 21162973031. The next prime is 21162973067. The reversal of 21162973061 is 16037926112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21162973061 - 2¹⁸ = 21162710917 is a prime.

It is a super-2 number, since 2×21162973061² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21162973067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 973436 + ... + 994938.

It is an arithmetic number, because the mean of its divisors is an integer number (2655313920).

Almost surely, 2^21162973061 is an apocalyptic number.

It is an amenable number.

21162973061 is a deficient number, since it is larger than the sum of its proper divisors (79538299).

21162973061 is a wasteful number, since it uses less digits than its factorization.

21162973061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25155.

The product of its (nonzero) digits is 27216, while the sum is 38.

The spelling of 21162973061 in words is "twenty-one billion, one hundred sixty-two million, nine hundred seventy-three thousand, sixty-one".