21002230988 has 6 divisors (see below), whose sum is σ = 36753904236. Its totient is φ = 10501115492.

The previous prime is 21002230943. The next prime is 21002231023. The reversal of 21002230988 is 88903220012.

It is a super-2 number, since 2×21002230988² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2625278870 + ... + 2625278877.

It is an arithmetic number, because the mean of its divisors is an integer number (6125650706).

Almost surely, 2^21002230988 is an apocalyptic number.

It is an amenable number.

21002230988 is a deficient number, since it is larger than the sum of its proper divisors (15751673248).

21002230988 is a wasteful number, since it uses less digits than its factorization.

21002230988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5250557751 (or 5250557749 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 35.

The spelling of 21002230988 in words is "twenty-one billion, two million, two hundred thirty thousand, nine hundred eighty-eight".