21226839707 has 4 divisors (see below), whose sum is σ = 21414687960. Its totient is φ = 21038991456.

The previous prime is 21226839661. The next prime is 21226839709. The reversal of 21226839707 is 70793862212.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21226839707 - 2⁸ = 21226839451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21226839709) 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, 93923957 + ... + 93924182.

It is an arithmetic number, because the mean of its divisors is an integer number (5353671990).

Almost surely, 2^21226839707 is an apocalyptic number.

21226839707 is a deficient number, since it is larger than the sum of its proper divisors (187848253).

21226839707 is a wasteful number, since it uses less digits than its factorization.

21226839707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187848252.

The product of its (nonzero) digits is 508032, while the sum is 47.

The spelling of 21226839707 in words is "twenty-one billion, two hundred twenty-six million, eight hundred thirty-nine thousand, seven hundred seven".