21121503610 has 16 divisors (see below), whose sum is σ = 38374023456. Its totient is φ = 8369642128.

The previous prime is 21121503581. The next prime is 21121503631. The reversal of 21121503610 is 1630512112.

It is a happy number.

It is a super-2 number, since 2×21121503610² (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, 9868792 + ... + 9870931.

It is an arithmetic number, because the mean of its divisors is an integer number (2398376466).

Almost surely, 2^21121503610 is an apocalyptic number.

21121503610 is a deficient number, since it is larger than the sum of its proper divisors (17252519846).

21121503610 is a wasteful number, since it uses less digits than its factorization.

21121503610 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19739837.

The product of its (nonzero) digits is 360, while the sum is 22.

The spelling of 21121503610 in words is "twenty-one billion, one hundred twenty-one million, five hundred three thousand, six hundred ten".