21022888621 has 8 divisors (see below), whose sum is σ = 24612162624. Its totient is φ = 17580115680.

The previous prime is 21022888609. The next prime is 21022888643. The reversal of 21022888621 is 12688822012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21022888621 - 2²¹ = 21020791469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022888661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36624955 + ... + 36625528.

It is an arithmetic number, because the mean of its divisors is an integer number (3076520328).

Almost surely, 2^21022888621 is an apocalyptic number.

It is an amenable number.

21022888621 is a deficient number, since it is larger than the sum of its proper divisors (3589274003).

21022888621 is an equidigital number, since it uses as much as digits as its factorization.

21022888621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73250531.

The product of its (nonzero) digits is 49152, while the sum is 40.

The spelling of 21022888621 in words is "twenty-one billion, twenty-two million, eight hundred eighty-eight thousand, six hundred twenty-one".