21010021100212 has 6 divisors (see below), whose sum is σ = 36767536925378. Its totient is φ = 10505010550104.

The previous prime is 21010021100069. The next prime is 21010021100249. The reversal of 21010021100212 is 21200112001012.

It can be written as a sum of positive squares in only one way, i.e., 18691752972816 + 2318268127396 = 4323396^2 + 1522586^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21010021100192 and 21010021100201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2626252637523 + ... + 2626252637530.

Almost surely, 2^{21010021100212} is an apocalyptic number.

It is an amenable number.

21010021100212 is a deficient number, since it is larger than the sum of its proper divisors (15757515825166).

21010021100212 is a wasteful number, since it uses less digits than its factorization.

21010021100212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5252505275057 (or 5252505275055 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21010021100212 its reverse (21200112001012), we get a palindrome (42210133101224).

The spelling of 21010021100212 in words is "twenty-one trillion, ten billion, twenty-one million, one hundred thousand, two hundred twelve".