21011202121122 has 12 divisors (see below), whose sum is σ = 45524271262470. Its totient is φ = 7003734040368.

The previous prime is 21011202121093. The next prime is 21011202121141. The reversal of 21011202121122 is 22112120211012.

21011202121122 is a `hidden beast` number, since 210 + 1 + 120 + 212 + 1 + 122 = 666.

It can be written as a sum of positive squares in only one way, i.e., 17383971409281 + 3627230711841 = 4169409^2 + 1904529^2 .

It is a super-2 number, since 2×21011202121122² (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), and also a Moran number because the ratio is a prime number: 1167289006729 = 21011202121122 / (2 + 1 + 0 + 1 + 1 + 2 + 0 + 2 + 1 + 2 + 1 + 1 + 2 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 21011202121095 and 21011202121104.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 583644503347 + ... + 583644503382.

Almost surely, 2^{21011202121122} is an apocalyptic number.

21011202121122 is an abundant number, since it is smaller than the sum of its proper divisors (24513069141348).

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

21011202121122 is a wasteful number, since it uses less digits than its factorization.

21011202121122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1167289006737 (or 1167289006734 counting only the distinct ones).

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

Adding to 21011202121122 its reverse (22112120211012), we get a palindrome (43123322332134).

The spelling of 21011202121122 in words is "twenty-one trillion, eleven billion, two hundred two million, one hundred twenty-one thousand, one hundred twenty-two".