21021111121122 has 120 divisors (see below), whose sum is σ = 53180972682864. Its totient is φ = 6000669691632.

The previous prime is 21021111121097. The next prime is 21021111121123. The reversal of 21021111121122 is 22112111112012.

It is a happy number.

21021111121122 is a `hidden beast` number, since 210 + 211 + 1 + 1 + 121 + 122 = 666.

It is a super-2 number, since 2×21021111121122² (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 = 21021111121095 and 21021111121104.

It is not an unprimeable number, because it can be changed into a prime (21021111121123) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 48317253 + ... + 48750375.

Almost surely, 2^{21021111121122} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21021111121122, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26590486341432).

21021111121122 is an abundant number, since it is smaller than the sum of its proper divisors (32159861561742).

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

21021111121122 is a wasteful number, since it uses less digits than its factorization.

21021111121122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434282 (or 434258 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 21021111121122 its reverse (22112111112012), we get a palindrome (43133222233134).

The spelling of 21021111121122 in words is "twenty-one trillion, twenty-one billion, one hundred eleven million, one hundred twenty-one thousand, one hundred twenty-two".