21927702790 has 64 divisors (see below), whose sum is σ = 47784297600. Its totient is φ = 7072505856.

The previous prime is 21927702737. The next prime is 21927702791. The reversal of 21927702790 is 9720772912.

It is a self number, because there is not a number n which added to its sum of digits gives 21927702790.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21927702791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4482666 + ... + 4487554.

It is an arithmetic number, because the mean of its divisors is an integer number (746629650).

Almost surely, 2^21927702790 is an apocalyptic number.

21927702790 is an abundant number, since it is smaller than the sum of its proper divisors (25856594810).

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

21927702790 is a wasteful number, since it uses less digits than its factorization.

21927702790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8689.

The product of its (nonzero) digits is 222264, while the sum is 46.

It can be divided in two parts, 2192770 and 2790, that added together give a triangular number (2195560 = T₂₀₉₅).

The spelling of 21927702790 in words is "twenty-one billion, nine hundred twenty-seven million, seven hundred two thousand, seven hundred ninety".