21122102020021 has 8 divisors (see below), whose sum is σ = 22615866011160. Its totient is φ = 19656258851328.

The previous prime is 21122102020013. The next prime is 21122102020093. The reversal of 21122102020021 is 12002020122112.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 960978287025 + 20161123732996 = 980295^2 + 4490114^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21122102020021 - 2³ = 21122102020013 is a prime.

It is a super-2 number, since 2×21122102020021² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21122102019977 and 21122102020004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122102021021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6980204046 + ... + 6980207071.

It is an arithmetic number, because the mean of its divisors is an integer number (2826983251395).

Almost surely, 2^{21122102020021} is an apocalyptic number.

It is an amenable number.

21122102020021 is a deficient number, since it is larger than the sum of its proper divisors (1493763991139).

21122102020021 is a wasteful number, since it uses less digits than its factorization.

21122102020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13960411223.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21122102020021 its reverse (12002020122112), we get a palindrome (33124122142133).

The spelling of 21122102020021 in words is "twenty-one trillion, one hundred twenty-two billion, one hundred two million, twenty thousand, twenty-one".