70437021 has 4 divisors (see below), whose sum is σ = 93916032. Its totient is φ = 46958012.

The previous prime is 70437019. The next prime is 70437049. The reversal of 70437021 is 12073407.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 70437021 - 2¹ = 70437019 is a prime.

It is a super-2 number, since 2×70437021² = 9922747854708882, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 70436982 and 70437000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70437821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11739501 + ... + 11739506.

It is an arithmetic number, because the mean of its divisors is an integer number (23479008).

Almost surely, 2^70437021 is an apocalyptic number.

It is an amenable number.

70437021 is a deficient number, since it is larger than the sum of its proper divisors (23479011).

70437021 is a wasteful number, since it uses less digits than its factorization.

70437021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23479010.

The product of its (nonzero) digits is 1176, while the sum is 24.

The square root of 70437021 is about 8392.6766290618. The cubic root of 70437021 is about 412.9844123668.

The spelling of 70437021 in words is "seventy million, four hundred thirty-seven thousand, twenty-one".