21100023122222 has 48 divisors (see below), whose sum is σ = 35386088900400. Its totient is φ = 9427642224000.

The previous prime is 21100023122159. The next prime is 21100023122267. The reversal of 21100023122222 is 22222132000112.

It is a junction number, because it is equal to n+sod(n) for n = 21100023122194 and 21100023122203.

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, 292154 + ... + 6502722.

It is an arithmetic number, because the mean of its divisors is an integer number (737210185425).

Almost surely, 2^{21100023122222} is an apocalyptic number.

21100023122222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21100023122222 is a deficient number, since it is larger than the sum of its proper divisors (14286065778178).

21100023122222 is a wasteful number, since it uses less digits than its factorization.

21100023122222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6210833 (or 6210822 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21100023122222 its reverse (22222132000112), we get a palindrome (43322155122334).

The spelling of 21100023122222 in words is "twenty-one trillion, one hundred billion, twenty-three million, one hundred twenty-two thousand, two hundred twenty-two".