21101220122022 has 48 divisors (see below), whose sum is σ = 49489472908080. Its totient is φ = 6663543190272.

The previous prime is 21101220121997. The next prime is 21101220122027. The reversal of 21101220122022 is 22022102210112.

It is a happy number.

21101220122022 is a `hidden beast` number, since 211 + 0 + 12 + 201 + 220 + 22 = 666.

It is a super-2 number, since 2×21101220122022² (a number of 27 digits) contains 22 as substring.

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 = 21101220121986 and 21101220122004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101220122027) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 541203963 + ... + 541242950.

It is an arithmetic number, because the mean of its divisors is an integer number (1031030685585).

Almost surely, 2^{21101220122022} is an apocalyptic number.

21101220122022 is an abundant number, since it is smaller than the sum of its proper divisors (28388252786058).

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

21101220122022 is a wasteful number, since it uses less digits than its factorization.

21101220122022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1082446962 (or 1082446937 counting only the distinct ones).

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

Adding to 21101220122022 its reverse (22022102210112), we get a palindrome (43123322332134).

The spelling of 21101220122022 in words is "twenty-one trillion, one hundred one billion, two hundred twenty million, one hundred twenty-two thousand, twenty-two".