21020210122210 has 16 divisors (see below), whose sum is σ = 40746868852536. Its totient is φ = 7761308352768.

The previous prime is 21020210122207. The next prime is 21020210122213. The reversal of 21020210122210 is 1222101202012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21020210122207) and next prime (21020210122213).

It can be written as a sum of positive squares in 4 ways, for example, as 8754041790729 + 12266168331481 = 2958723^2 + 3502309^2 .

It is not an unprimeable number, because it can be changed into a prime (21020210122213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80846961879 + ... + 80846962138.

Almost surely, 2^{21020210122210} is an apocalyptic number.

21020210122210 is a deficient number, since it is larger than the sum of its proper divisors (19726658730326).

21020210122210 is a wasteful number, since it uses less digits than its factorization.

21020210122210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161693924037.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21020210122210 its reverse (1222101202012), we get a palindrome (22242311324222).

The spelling of 21020210122210 in words is "twenty-one trillion, twenty billion, two hundred ten million, one hundred twenty-two thousand, two hundred ten".