21012100122222 has 48 divisors (see below), whose sum is σ = 51267059550720. Its totient is φ = 6161906192400.

The previous prime is 21012100122199. The next prime is 21012100122239. The reversal of 21012100122222 is 22222100121012.

It is a happy number.

21012100122222 is a `hidden beast` number, since 210 + 1 + 210 + 0 + 1 + 22 + 222 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21012100122195 and 21012100122204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1711634472 + ... + 1711646747.

It is an arithmetic number, because the mean of its divisors is an integer number (1068063740640).

Almost surely, 2^{21012100122222} is an apocalyptic number.

21012100122222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21012100122222 is an abundant number, since it is smaller than the sum of its proper divisors (30254959428498).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21012100122222 is a wasteful number, since it uses less digits than its factorization.

21012100122222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3423281269 (or 3423281266 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21012100122222 its reverse (22222100121012), we get a palindrome (43234200243234).

The spelling of 21012100122222 in words is "twenty-one trillion, twelve billion, one hundred million, one hundred twenty-two thousand, two hundred twenty-two".