21420746588 has 6 divisors (see below), whose sum is σ = 37486306536. Its totient is φ = 10710373292.

The previous prime is 21420746579. The next prime is 21420746591. The reversal of 21420746588 is 88564702412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2677593320 + ... + 2677593327.

It is an arithmetic number, because the mean of its divisors is an integer number (6247717756).

Almost surely, 2^21420746588 is an apocalyptic number.

It is an amenable number.

21420746588 is a deficient number, since it is larger than the sum of its proper divisors (16065559948).

21420746588 is a wasteful number, since it uses less digits than its factorization.

21420746588 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5355186651 (or 5355186649 counting only the distinct ones).

The product of its (nonzero) digits is 860160, while the sum is 47.

The spelling of 21420746588 in words is "twenty-one billion, four hundred twenty million, seven hundred forty-six thousand, five hundred eighty-eight".