21053001213 has 12 divisors (see below), whose sum is σ = 30411486300. Its totient is φ = 14034597696.

The previous prime is 21053001173. The next prime is 21053001241. The reversal of 21053001213 is 31210035012.

21053001213 is a `hidden beast` number, since 2 + 10 + 530 + 0 + 121 + 3 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 8829045369 + 12223955844 = 93963^2 + 110562^2 .

It is not a de Polignac number, because 21053001213 - 2¹⁴ = 21052984829 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 (21053001253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 162763 + ... + 261911.

It is an arithmetic number, because the mean of its divisors is an integer number (2534290525).

Almost surely, 2^21053001213 is an apocalyptic number.

It is an amenable number.

21053001213 is a deficient number, since it is larger than the sum of its proper divisors (9358485087).

21053001213 is a wasteful number, since it uses less digits than its factorization.

21053001213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122748 (or 122745 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

Adding to 21053001213 its reverse (31210035012), we get a palindrome (52263036225).

The spelling of 21053001213 in words is "twenty-one billion, fifty-three million, one thousand, two hundred thirteen".