21111211100022 has 32 divisors (see below), whose sum is σ = 42239371415040. Its totient is φ = 7034246078400.

The previous prime is 21111211099991. The next prime is 21111211100027. The reversal of 21111211100022 is 22000111211112.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21111211099974 and 21111211100010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111211100027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 156368647 + ... + 156503597.

It is an arithmetic number, because the mean of its divisors is an integer number (1319980356720).

Almost surely, 2^{21111211100022} is an apocalyptic number.

21111211100022 is an abundant number, since it is smaller than the sum of its proper divisors (21128160315018).

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

21111211100022 is a wasteful number, since it uses less digits than its factorization.

21111211100022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145228.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21111211100022 its reverse (22000111211112), we get a palindrome (43111322311134).

The spelling of 21111211100022 in words is "twenty-one trillion, one hundred eleven billion, two hundred eleven million, one hundred thousand, twenty-two".