21351353002 has 12 divisors (see below), whose sum is σ = 37255932450. Its totient is φ = 9150579816.

The previous prime is 21351352993. The next prime is 21351353021. The reversal of 21351353002 is 20035315312.

It can be written as a sum of positive squares in only one way, i.e., 16728576921 + 4622776081 = 129339^2 + 67991^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 108935377 + ... + 108935572.

Almost surely, 2^21351353002 is an apocalyptic number.

21351353002 is a deficient number, since it is larger than the sum of its proper divisors (15904579448).

21351353002 is a wasteful number, since it uses less digits than its factorization.

21351353002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217870965 (or 217870958 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 25.

Adding to 21351353002 its reverse (20035315312), we get a palindrome (41386668314).

The spelling of 21351353002 in words is "twenty-one billion, three hundred fifty-one million, three hundred fifty-three thousand, two".