21101221022022 has 24 divisors (see below), whose sum is σ = 45719786085480. Its totient is φ = 7033667437440.

The previous prime is 21101221021967. The next prime is 21101221022029. The reversal of 21101221022022 is 22022012210112.

It is a happy number.

21101221022022 is a `hidden beast` number, since 211 + 0 + 1 + 2 + 210 + 220 + 22 = 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 = 21101221021986 and 21101221022004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101221022029) 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, 4275979 + ... + 7777302.

It is an arithmetic number, because the mean of its divisors is an integer number (1904991086895).

Almost surely, 2^{21101221022022} is an apocalyptic number.

21101221022022 is an abundant number, since it is smaller than the sum of its proper divisors (24618565063458).

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

21101221022022 is a wasteful number, since it uses less digits than its factorization.

21101221022022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12150548 (or 12150545 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21101221022022 its reverse (22022012210112), we get a palindrome (43123233232134).

The spelling of 21101221022022 in words is "twenty-one trillion, one hundred one billion, two hundred twenty-one million, twenty-two thousand, twenty-two".