222222000000021 has 32 divisors (see below), whose sum is σ = 338715825631488. Its totient is φ = 126949569761280.

The previous prime is 222221999999983. The next prime is 222222000000047. The reversal of 222222000000021 is 120000000222222.

It is not a de Polignac number, because 222222000000021 - 2⁶ = 222221999999957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222222000002021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1344818221 + ... + 1344983453.

It is an arithmetic number, because the mean of its divisors is an integer number (10584869550984).

Almost surely, 2^{222222000000021} is an apocalyptic number.

222222000000021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

222222000000021 is a deficient number, since it is larger than the sum of its proper divisors (116493825631467).

222222000000021 is a wasteful number, since it uses less digits than its factorization.

222222000000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182221.

The product of its (nonzero) digits is 128, while the sum is 15.

Adding to 222222000000021 its reverse (120000000222222), we get a palindrome (342222000222243).

The spelling of 222222000000021 in words is "two hundred twenty-two trillion, two hundred twenty-two billion, twenty-one", and thus it is an aban number.