21010020213 has 32 divisors (see below), whose sum is σ = 34495073536. Its totient is φ = 11076715008.

The previous prime is 21010020179. The next prime is 21010020223. The reversal of 21010020213 is 31202001012.

It is not a de Polignac number, because 21010020213 - 2⁸ = 21010019957 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 (21010020223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 565395 + ... + 601407.

It is an arithmetic number, because the mean of its divisors is an integer number (1077971048).

Almost surely, 2^21010020213 is an apocalyptic number.

It is an amenable number.

21010020213 is a deficient number, since it is larger than the sum of its proper divisors (13485053323).

21010020213 is a wasteful number, since it uses less digits than its factorization.

21010020213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38173.

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

Adding to 21010020213 its reverse (31202001012), we get a palindrome (52212021225).

The spelling of 21010020213 in words is "twenty-one billion, ten million, twenty thousand, two hundred thirteen".