21221626313 has 4 divisors (see below), whose sum is σ = 21243573120. Its totient is φ = 21199679508.

The previous prime is 21221626301. The next prime is 21221626333. The reversal of 21221626313 is 31362612212.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21221626313 - 2¹² = 21221622217 is a prime.

It is a super-2 number, since 2×21221626313² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21221626333) 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, 10971953 + ... + 10973886.

It is an arithmetic number, because the mean of its divisors is an integer number (5310893280).

Almost surely, 2^21221626313 is an apocalyptic number.

It is an amenable number.

21221626313 is a deficient number, since it is larger than the sum of its proper divisors (21946807).

21221626313 is an equidigital number, since it uses as much as digits as its factorization.

21221626313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21946806.

The product of its digits is 5184, while the sum is 29.

The spelling of 21221626313 in words is "twenty-one billion, two hundred twenty-one million, six hundred twenty-six thousand, three hundred thirteen".