70974820921 has 3 divisors (see below), whose sum is σ = 70975087333. Its totient is φ = 70974554510.

The previous prime is 70974820919. The next prime is 70974820927. The reversal of 70974820921 is 12902847907.

The square root of 70974820921 is 266411.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 70974820921 - 2¹ = 70974820919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70974820927) 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 2 ways as a sum of consecutive naturals, for example, 133206 + ... + 399616.

Almost surely, 2^70974820921 is an apocalyptic number.

70974820921 is the 266411-st square number.

70974820921 is the 133206-th centered octagonal number.

It is an amenable number.

70974820921 is a deficient number, since it is larger than the sum of its proper divisors (266412).

70974820921 is an frugal number, since it uses more digits than its factorization.

70974820921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 532822 (or 266411 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 49.

Multiplying 70974820921 by its sum of digits (49), we get a square (3477766225129 = 1864877²).

The spelling of 70974820921 in words is "seventy billion, nine hundred seventy-four million, eight hundred twenty thousand, nine hundred twenty-one".