21012112112122 has 8 divisors (see below), whose sum is σ = 31518189925236. Its totient is φ = 10506048803712.

The previous prime is 21012112112099. The next prime is 21012112112137. The reversal of 21012112112122 is 22121121121012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19928912000761 + 1083200111361 = 4464181^2 + 1040769^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21012112112122.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1374868 + ... + 6626800.

Almost surely, 2^{21012112112122} is an apocalyptic number.

21012112112122 is a deficient number, since it is larger than the sum of its proper divisors (10506077813114).

21012112112122 is a wasteful number, since it uses less digits than its factorization.

21012112112122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7252352.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 21012112112122 its reverse (22121121121012), we get a palindrome (43133233233134).

The spelling of 21012112112122 in words is "twenty-one trillion, twelve billion, one hundred twelve million, one hundred twelve thousand, one hundred twenty-two".