21126319782 has 16 divisors (see below), whose sum is σ = 42262996800. Its totient is φ = 7040380392.

The previous prime is 21126319763. The next prime is 21126319843. The reversal of 21126319782 is 28791362112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 404908 + ... + 454095.

It is an arithmetic number, because the mean of its divisors is an integer number (2641437300).

Almost surely, 2^21126319782 is an apocalyptic number.

21126319782 is an abundant number, since it is smaller than the sum of its proper divisors (21136677018).

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

21126319782 is a wasteful number, since it uses less digits than its factorization.

21126319782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 863107.

The product of its digits is 72576, while the sum is 42.

The spelling of 21126319782 in words is "twenty-one billion, one hundred twenty-six million, three hundred nineteen thousand, seven hundred eighty-two".