21870351722 has 4 divisors (see below), whose sum is σ = 32805527586. Its totient is φ = 10935175860.

The previous prime is 21870351623. The next prime is 21870351739. The reversal of 21870351722 is 22715307812.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 14762007001 + 7108344721 = 121499^2 + 84311^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5467587929 + ... + 5467587932.

Almost surely, 2^21870351722 is an apocalyptic number.

21870351722 is a deficient number, since it is larger than the sum of its proper divisors (10935175864).

21870351722 is a wasteful number, since it uses less digits than its factorization.

21870351722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10935175863.

The product of its (nonzero) digits is 47040, while the sum is 38.

The spelling of 21870351722 in words is "twenty-one billion, eight hundred seventy million, three hundred fifty-one thousand, seven hundred twenty-two".