21020100213 has 64 divisors (see below), whose sum is σ = 33292800000. Its totient is φ = 11789249472.

The previous prime is 21020100163. The next prime is 21020100239. The reversal of 21020100213 is 31200102012.

It is not a de Polignac number, because 21020100213 - 2¹⁰ = 21020099189 is a prime.

It is a super-2 number, since 2×21020100213² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020100613) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 35091688 + ... + 35092286.

It is an arithmetic number, because the mean of its divisors is an integer number (520200000).

Almost surely, 2^21020100213 is an apocalyptic number.

It is an amenable number.

21020100213 is a deficient number, since it is larger than the sum of its proper divisors (12272699787).

21020100213 is an equidigital number, since it uses as much as digits as its factorization.

21020100213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1199 (or 1185 counting only the distinct ones).

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

Adding to 21020100213 its reverse (31200102012), we get a palindrome (52220202225).

The spelling of 21020100213 in words is "twenty-one billion, twenty million, one hundred thousand, two hundred thirteen".