21770751072 has 96 divisors (see below), whose sum is σ = 69154186752. Its totient is φ = 5854316544.

The previous prime is 21770751031. The next prime is 21770751073. The reversal of 21770751072 is 27015707712.

It is a tau number, because it is divible by the number of its divisors (96).

It is a self number, because there is not a number n which added to its sum of digits gives 21770751072.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21770751073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 941428 + ... + 964275.

It is an arithmetic number, because the mean of its divisors is an integer number (720356112).

Almost surely, 2^21770751072 is an apocalyptic number.

It is an amenable number.

21770751072 is an abundant number, since it is smaller than the sum of its proper divisors (47383435680).

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

21770751072 is a wasteful number, since it uses less digits than its factorization.

21770751072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1905740 (or 1905732 counting only the distinct ones).

The product of its (nonzero) digits is 48020, while the sum is 39.

The spelling of 21770751072 in words is "twenty-one billion, seven hundred seventy million, seven hundred fifty-one thousand, seventy-two".