21162651010010 has 16 divisors (see below), whose sum is σ = 38230290854856. Its totient is φ = 8434500618048.

The previous prime is 21162651010001. The next prime is 21162651010013. The reversal of 21162651010010 is 1001015626112.

It can be written as a sum of positive squares in 4 ways, for example, as 12797211227761 + 8365439782249 = 3577319^2 + 2892307^2 .

It is not an unprimeable number, because it can be changed into a prime (21162651010013) 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, 3819970337 + ... + 3819975876.

Almost surely, 2^{21162651010010} is an apocalyptic number.

21162651010010 is a deficient number, since it is larger than the sum of its proper divisors (17067639844846).

21162651010010 is a wasteful number, since it uses less digits than its factorization.

21162651010010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7639946497.

The product of its (nonzero) digits is 720, while the sum is 26.

Adding to 21162651010010 its reverse (1001015626112), we get a palindrome (22163666636122).

The spelling of 21162651010010 in words is "twenty-one trillion, one hundred sixty-two billion, six hundred fifty-one million, ten thousand, ten".