21202253450 has 96 divisors (see below), whose sum is σ = 46119369600. Its totient is φ = 7248864000.

The previous prime is 21202253441. The next prime is 21202253467. The reversal of 21202253450 is 5435220212.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6875609 + ... + 6878691.

It is an arithmetic number, because the mean of its divisors is an integer number (480410100).

Almost surely, 2^21202253450 is an apocalyptic number.

21202253450 is an abundant number, since it is smaller than the sum of its proper divisors (24917116150).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21202253450 is a wasteful number, since it uses less digits than its factorization.

21202253450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3517 (or 3498 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 26.

Adding to 21202253450 its reverse (5435220212), we get a palindrome (26637473662).

The spelling of 21202253450 in words is "twenty-one billion, two hundred two million, two hundred fifty-three thousand, four hundred fifty".