21231633430 has 32 divisors (see below), whose sum is σ = 43684634880. Its totient is φ = 7278061920.

The previous prime is 21231633427. The next prime is 21231633457. The reversal of 21231633430 is 3433613212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 395541 + ... + 445999.

It is an arithmetic number, because the mean of its divisors is an integer number (1365144840).

Almost surely, 2^21231633430 is an apocalyptic number.

21231633430 is an abundant number, since it is smaller than the sum of its proper divisors (22453001450).

21231633430 is a wasteful number, since it uses less digits than its factorization.

21231633430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56484.

The product of its (nonzero) digits is 7776, while the sum is 28.

The spelling of 21231633430 in words is "twenty-one billion, two hundred thirty-one million, six hundred thirty-three thousand, four hundred thirty".