21111121022222 has 64 divisors (see below), whose sum is σ = 41845110312960. Its totient is φ = 7733469427200.

The previous prime is 21111121022213. The next prime is 21111121022261. The reversal of 21111121022222 is 22222012111112.

It is a junction number, because it is equal to n+sod(n) for n = 21111121022194 and 21111121022203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1474097 + ... + 6662972.

It is an arithmetic number, because the mean of its divisors is an integer number (653829848640).

Almost surely, 2^{21111121022222} is an apocalyptic number.

21111121022222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21111121022222 is a deficient number, since it is larger than the sum of its proper divisors (20733989290738).

21111121022222 is a wasteful number, since it uses less digits than its factorization.

21111121022222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8138097.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 21111121022222 its reverse (22222012111112), we get a palindrome (43333133133334).

The spelling of 21111121022222 in words is "twenty-one trillion, one hundred eleven billion, one hundred twenty-one million, twenty-two thousand, two hundred twenty-two".