21220010013 has 16 divisors (see below), whose sum is σ = 29583668736. Its totient is φ = 13504019760.

The previous prime is 21220009973. The next prime is 21220010023. The reversal of 21220010013 is 31001002212.

It is not a de Polignac number, because 21220010013 - 2¹⁸ = 21219747869 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220010023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 279295 + ... + 347052.

It is an arithmetic number, because the mean of its divisors is an integer number (1848979296).

Almost surely, 2^21220010013 is an apocalyptic number.

21220010013 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21220010013 is a deficient number, since it is larger than the sum of its proper divisors (8363658723).

21220010013 is a wasteful number, since it uses less digits than its factorization.

21220010013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 626864.

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 21220010013 its reverse (31001002212), we get a palindrome (52221012225).

The spelling of 21220010013 in words is "twenty-one billion, two hundred twenty million, ten thousand, thirteen".