21670436707 has 4 divisors (see below), whose sum is σ = 22945168296. Its totient is φ = 20395705120.

The previous prime is 21670436701. The next prime is 21670436713. The reversal of 21670436707 is 70763407612.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21670436701) and next prime (21670436713).

It is not a de Polignac number, because 21670436707 - 2¹⁹ = 21669912419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21670436701) 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, 637365769 + ... + 637365802.

It is an arithmetic number, because the mean of its divisors is an integer number (5736292074).

Almost surely, 2^21670436707 is an apocalyptic number.

21670436707 is a deficient number, since it is larger than the sum of its proper divisors (1274731589).

21670436707 is a wasteful number, since it uses less digits than its factorization.

21670436707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1274731588.

The product of its (nonzero) digits is 296352, while the sum is 43.

The spelling of 21670436707 in words is "twenty-one billion, six hundred seventy million, four hundred thirty-six thousand, seven hundred seven".