21121535002 has 16 divisors (see below), whose sum is σ = 32046601320. Its totient is φ = 10439396352.

The previous prime is 21121534999. The next prime is 21121535069. The reversal of 21121535002 is 20053512112.

It can be written as a sum of positive squares in 4 ways, for example, as 14559076921 + 6562458081 = 120661^2 + 81009^2 .

It is a super-2 number, since 2×21121535002² (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, 790168 + ... + 816460.

Almost surely, 2^21121535002 is an apocalyptic number.

21121535002 is a deficient number, since it is larger than the sum of its proper divisors (10925066318).

21121535002 is a wasteful number, since it uses less digits than its factorization.

21121535002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30897.

The product of its (nonzero) digits is 600, while the sum is 22.

The spelling of 21121535002 in words is "twenty-one billion, one hundred twenty-one million, five hundred thirty-five thousand, two".