21451430630 has 64 divisors (see below), whose sum is σ = 44916802560. Its totient is φ = 7223644800.

The previous prime is 21451430629. The next prime is 21451430687. The reversal of 21451430630 is 3603415412.

It is a junction number, because it is equal to n+sod(n) for n = 21451430593 and 21451430602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7684535 + ... + 7687325.

It is an arithmetic number, because the mean of its divisors is an integer number (701825040).

Almost surely, 2^21451430630 is an apocalyptic number.

21451430630 is an abundant number, since it is smaller than the sum of its proper divisors (23465371930).

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

21451430630 is a wasteful number, since it uses less digits than its factorization.

21451430630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4725.

The product of its (nonzero) digits is 8640, while the sum is 29.

The spelling of 21451430630 in words is "twenty-one billion, four hundred fifty-one million, four hundred thirty thousand, six hundred thirty".