21020010213 has 64 divisors (see below), whose sum is σ = 31684366080. Its totient is φ = 12317184000.

The previous prime is 21020010203. The next prime is 21020010223. The reversal of 21020010213 is 31201002012.

It is an interprime number because it is at equal distance from previous prime (21020010203) and next prime (21020010223).

It is not a de Polignac number, because 21020010213 - 2⁶ = 21020010149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020010203) 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, 38853723 + ... + 38854263.

It is an arithmetic number, because the mean of its divisors is an integer number (495068220).

Almost surely, 2^21020010213 is an apocalyptic number.

It is an amenable number.

21020010213 is a deficient number, since it is larger than the sum of its proper divisors (10664355867).

21020010213 is a wasteful number, since it uses less digits than its factorization.

21020010213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1078.

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

Adding to 21020010213 its reverse (31201002012), we get a palindrome (52221012225).

The spelling of 21020010213 in words is "twenty-one billion, twenty million, ten thousand, two hundred thirteen".