21111212010222 has 24 divisors (see below), whose sum is σ = 45887096618064. Its totient is φ = 7014588014304.

The previous prime is 21111212010193. The next prime is 21111212010223. The reversal of 21111212010222 is 22201021211112.

21111212010222 is a `hidden beast` number, since 211 + 11 + 21 + 201 + 0 + 222 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21111212010195 and 21111212010204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111212010223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1873548858 + ... + 1873560125.

It is an arithmetic number, because the mean of its divisors is an integer number (1911962359086).

Almost surely, 2^{21111212010222} is an apocalyptic number.

21111212010222 is an abundant number, since it is smaller than the sum of its proper divisors (24775884607842).

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

21111212010222 is a wasteful number, since it uses less digits than its factorization.

21111212010222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3747109304 (or 3747109301 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21111212010222 its reverse (22201021211112), we get a palindrome (43312233221334).

The spelling of 21111212010222 in words is "twenty-one trillion, one hundred eleven billion, two hundred twelve million, ten thousand, two hundred twenty-two".