21262985210 has 16 divisors (see below), whose sum is σ = 38797667496. Its totient is φ = 8388684288.

The previous prime is 21262985203. The next prime is 21262985221. The reversal of 21262985210 is 1258926212.

It can be written as a sum of positive squares in 4 ways, for example, as 20524287169 + 738698041 = 143263^2 + 27179^2 .

It is a super-2 number, since 2×21262985210² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14562959 + ... + 14564418.

Almost surely, 2^21262985210 is an apocalyptic number.

21262985210 is a deficient number, since it is larger than the sum of its proper divisors (17534682286).

21262985210 is a wasteful number, since it uses less digits than its factorization.

21262985210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29127457.

The product of its (nonzero) digits is 34560, while the sum is 38.

The spelling of 21262985210 in words is "twenty-one billion, two hundred sixty-two million, nine hundred eighty-five thousand, two hundred ten".