21011021122122 has 32 divisors (see below), whose sum is σ = 47004521544000. Its totient is φ = 6956669183184.

The previous prime is 21011021122111. The next prime is 21011021122123. The reversal of 21011021122122 is 22122112011012.

21011021122122 is a `hidden beast` number, since 210 + 1 + 1 + 0 + 211 + 221 + 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 = 21011021122095 and 21011021122104.

It is not an unprimeable number, because it can be changed into a prime (21011021122123) 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, 1305673108 + ... + 1305689199.

It is an arithmetic number, because the mean of its divisors is an integer number (1468891298250).

Almost surely, 2^{21011021122122} is an apocalyptic number.

21011021122122 is an abundant number, since it is smaller than the sum of its proper divisors (25993500421878).

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

21011021122122 is a wasteful number, since it uses less digits than its factorization.

21011021122122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2611362467 (or 2611362461 counting only the distinct ones).

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

Adding to 21011021122122 its reverse (22122112011012), we get a palindrome (43133133133134).

The spelling of 21011021122122 in words is "twenty-one trillion, eleven billion, twenty-one million, one hundred twenty-two thousand, one hundred twenty-two".