70972821 has 16 divisors (see below), whose sum is σ = 105316800. Its totient is φ = 47237904.

The previous prime is 70972817. The next prime is 70972849. The reversal of 70972821 is 12827907.

It is not a de Polignac number, because 70972821 - 2² = 70972817 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70972621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18175 + ... + 21731.

It is an arithmetic number, because the mean of its divisors is an integer number (6582300).

Almost surely, 2^70972821 is an apocalyptic number.

It is an amenable number.

70972821 is a deficient number, since it is larger than the sum of its proper divisors (34343979).

70972821 is a wasteful number, since it uses less digits than its factorization.

70972821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4305 (or 4299 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 70972821 is about 8424.5368418685. The cubic root of 70972821 is about 414.0289309755.

The spelling of 70972821 in words is "seventy million, nine hundred seventy-two thousand, eight hundred twenty-one".