21701331407 has 4 divisors (see below), whose sum is σ = 24801521616. Its totient is φ = 18601141200.

The previous prime is 21701331389. The next prime is 21701331409. The reversal of 21701331407 is 70413310712.

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 21701331407 - 2¹⁸ = 21701069263 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21701331407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21701331409) 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, 1550095094 + ... + 1550095107.

It is an arithmetic number, because the mean of its divisors is an integer number (6200380404).

Almost surely, 2^21701331407 is an apocalyptic number.

21701331407 is a deficient number, since it is larger than the sum of its proper divisors (3100190209).

21701331407 is an equidigital number, since it uses as much as digits as its factorization.

21701331407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3100190208.

The product of its (nonzero) digits is 3528, while the sum is 29.

The spelling of 21701331407 in words is "twenty-one billion, seven hundred one million, three hundred thirty-one thousand, four hundred seven".