20921444412407 has 32 divisors (see below), whose sum is σ = 26186397133824. Its totient is φ = 16238426630400.

The previous prime is 20921444412403. The next prime is 20921444412503. The reversal of 20921444412407 is 70421444412902.

It is a cyclic number.

It is not a de Polignac number, because 20921444412407 - 2² = 20921444412403 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20921444412403) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32628557 + ... + 33263577.

It is an arithmetic number, because the mean of its divisors is an integer number (818324910432).

Almost surely, 2^{20921444412407} is an apocalyptic number.

20921444412407 is a deficient number, since it is larger than the sum of its proper divisors (5264952721417).

20921444412407 is a wasteful number, since it uses less digits than its factorization.

20921444412407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636719.

The product of its (nonzero) digits is 516096, while the sum is 44.

The spelling of 20921444412407 in words is "twenty trillion, nine hundred twenty-one billion, four hundred forty-four million, four hundred twelve thousand, four hundred seven".