21570635019 has 8 divisors (see below), whose sum is σ = 28765770640. Its totient is φ = 14377961376.

The previous prime is 21570634859. The next prime is 21570635033. The reversal of 21570635019 is 91053607512.

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

It is not a de Polignac number, because 21570635019 - 2¹⁶ = 21570569483 is a prime.

It is a super-2 number, since 2×21570635019² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21570635819) 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, 594952 + ... + 630165.

It is an arithmetic number, because the mean of its divisors is an integer number (3595721330).

Almost surely, 2^21570635019 is an apocalyptic number.

21570635019 is a deficient number, since it is larger than the sum of its proper divisors (7195135621).

21570635019 is a wasteful number, since it uses less digits than its factorization.

21570635019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1230989.

The product of its (nonzero) digits is 56700, while the sum is 39.

The spelling of 21570635019 in words is "twenty-one billion, five hundred seventy million, six hundred thirty-five thousand, nineteen".