21122707247 has 8 divisors (see below), whose sum is σ = 22481104896. Its totient is φ = 19777185792.

The previous prime is 21122707219. The next prime is 21122707261. The reversal of 21122707247 is 74270722112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21122707247 - 2²⁶ = 21055598383 is a prime.

It is a super-2 number, since 2×21122707247² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122707447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3215663 + ... + 3222224.

It is an arithmetic number, because the mean of its divisors is an integer number (2810138112).

Almost surely, 2^21122707247 is an apocalyptic number.

21122707247 is a deficient number, since it is larger than the sum of its proper divisors (1358397649).

21122707247 is a wasteful number, since it uses less digits than its factorization.

21122707247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6438097.

The product of its (nonzero) digits is 21952, while the sum is 35.

The spelling of 21122707247 in words is "twenty-one billion, one hundred twenty-two million, seven hundred seven thousand, two hundred forty-seven".