70716921 has 16 divisors (see below), whose sum is σ = 106180608. Its totient is φ = 41475600.

The previous prime is 70716901. The next prime is 70716931. The reversal of 70716921 is 12961707.

It is not a de Polignac number, because 70716921 - 2¹⁴ = 70700537 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (70716901) 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, 33541 + ... + 35586.

It is an arithmetic number, because the mean of its divisors is an integer number (6636288).

Almost surely, 2^70716921 is an apocalyptic number.

It is an amenable number.

70716921 is a deficient number, since it is larger than the sum of its proper divisors (35463687).

70716921 is a wasteful number, since it uses less digits than its factorization.

70716921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69172.

The product of its (nonzero) digits is 5292, while the sum is 33.

The square root of 70716921 is about 8409.3353482900. The cubic root of 70716921 is about 413.5307233724.

The spelling of 70716921 in words is "seventy million, seven hundred sixteen thousand, nine hundred twenty-one".