21122020012021 has 32 divisors (see below), whose sum is σ = 22704819177600. Its totient is φ = 19580059238400.

The previous prime is 21122020012019. The next prime is 21122020012057. The reversal of 21122020012021 is 12021002022112.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21122020012021 - 2¹ = 21122020012019 is a prime.

It is a super-2 number, since 2×21122020012021² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21122020011986 and 21122020012004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122020012001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 134412946 + ... + 134569996.

It is an arithmetic number, because the mean of its divisors is an integer number (709525599300).

Almost surely, 2^{21122020012021} is an apocalyptic number.

It is an amenable number.

21122020012021 is a deficient number, since it is larger than the sum of its proper divisors (1582799165579).

21122020012021 is a wasteful number, since it uses less digits than its factorization.

21122020012021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157669.

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

Adding to 21122020012021 its reverse (12021002022112), we get a palindrome (33143022034133).

The spelling of 21122020012021 in words is "twenty-one trillion, one hundred twenty-two billion, twenty million, twelve thousand, twenty-one".