21167061661010 has 16 divisors (see below), whose sum is σ = 39029996624472. Its totient is φ = 8260316745600.

The previous prime is 21167061661001. The next prime is 21167061661019. The reversal of 21167061661010 is 1016616076112.

It is an interprime number because it is at equal distance from previous prime (21167061661001) and next prime (21167061661019).

It can be written as a sum of positive squares in 4 ways, for example, as 18153334412929 + 3013727248081 = 4260673^2 + 1736009^2 .

It is not an unprimeable number, because it can be changed into a prime (21167061661019) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25813489421 + ... + 25813490240.

Almost surely, 2^{21167061661010} is an apocalyptic number.

21167061661010 is a deficient number, since it is larger than the sum of its proper divisors (17862934963462).

21167061661010 is a wasteful number, since it uses less digits than its factorization.

21167061661010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51626979709.

The product of its (nonzero) digits is 18144, while the sum is 38.

The spelling of 21167061661010 in words is "twenty-one trillion, one hundred sixty-seven billion, sixty-one million, six hundred sixty-one thousand, ten".