21489067610 has 32 divisors (see below), whose sum is σ = 38777492880. Its totient is φ = 8574066688.

The previous prime is 21489067571. The next prime is 21489067619. The reversal of 21489067610 is 1676098412.

It can be written as a sum of positive squares in 8 ways, for example, as 31798321 + 21457269289 = 5639^2 + 146483^2 .

It is a super-2 number, since 2×21489067610² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21489067619) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10890584 + ... + 10892556.

Almost surely, 2^21489067610 is an apocalyptic number.

21489067610 is a deficient number, since it is larger than the sum of its proper divisors (17288425270).

21489067610 is a wasteful number, since it uses less digits than its factorization.

21489067610 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4162.

The product of its (nonzero) digits is 145152, while the sum is 44.

The spelling of 21489067610 in words is "twenty-one billion, four hundred eighty-nine million, sixty-seven thousand, six hundred ten".