21770612521 has 8 divisors (see below), whose sum is σ = 25553151680. Its totient is φ = 18156186288.

The previous prime is 21770612477. The next prime is 21770612551. The reversal of 21770612521 is 12521607712.

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 21770612521 - 2⁹ = 21770612009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21770612551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42027951 + ... + 42028468.

It is an arithmetic number, because the mean of its divisors is an integer number (3194143960).

Almost surely, 2^21770612521 is an apocalyptic number.

It is an amenable number.

21770612521 is a deficient number, since it is larger than the sum of its proper divisors (3782539159).

21770612521 is an equidigital number, since it uses as much as digits as its factorization.

21770612521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84056463.

The product of its (nonzero) digits is 11760, while the sum is 34.

The spelling of 21770612521 in words is "twenty-one billion, seven hundred seventy million, six hundred twelve thousand, five hundred twenty-one".