222112100120021 has 8 divisors (see below), whose sum is σ = 222131851157304. Its totient is φ = 222092349958080.

The previous prime is 222112100120003. The next prime is 222112100120069. The reversal of 222112100120021 is 120021001211222.

It can be written as a sum of positive squares in 4 ways, for example, as 3374330194225 + 218737769925796 = 1836935^2 + 14789786^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 222112100120021 - 2¹⁸ = 222112099857877 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222112100120321) 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, 571851335 + ... + 572239611.

It is an arithmetic number, because the mean of its divisors is an integer number (27766481394663).

Almost surely, 2^{222112100120021} is an apocalyptic number.

It is an amenable number.

222112100120021 is a deficient number, since it is larger than the sum of its proper divisors (19751037283).

222112100120021 is a wasteful number, since it uses less digits than its factorization.

222112100120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437671.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 222112100120021 its reverse (120021001211222), we get a palindrome (342133101331243).

The spelling of 222112100120021 in words is "two hundred twenty-two trillion, one hundred twelve billion, one hundred million, one hundred twenty thousand, twenty-one".