21021112100122 has 4 divisors (see below), whose sum is σ = 31531668150186. Its totient is φ = 10510556050060.

The previous prime is 21021112100081. The next prime is 21021112100179. The reversal of 21021112100122 is 22100121112012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 19396810280761 + 1624301819361 = 4404181^2 + 1274481^2 .

It is a super-2 number, since 2×21021112100122² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21021112100096 and 21021112100105.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5255278025029 + ... + 5255278025032.

Almost surely, 2^{21021112100122} is an apocalyptic number.

21021112100122 is a deficient number, since it is larger than the sum of its proper divisors (10510556050064).

21021112100122 is a wasteful number, since it uses less digits than its factorization.

21021112100122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10510556050063.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21021112100122 its reverse (22100121112012), we get a palindrome (43121233212134).

The spelling of 21021112100122 in words is "twenty-one trillion, twenty-one billion, one hundred twelve million, one hundred thousand, one hundred twenty-two".