22121111202021 has 48 divisors (see below), whose sum is σ = 36442990125360. Its totient is φ = 12809337200640.

The previous prime is 22121111202019. The next prime is 22121111202023. The reversal of 22121111202021 is 12020211112122.

22121111202021 is a `hidden beast` number, since 221 + 211 + 11 + 20 + 202 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (22121111202019) and next prime (22121111202023).

It can be written as a sum of positive squares in 8 ways, for example, as 4499124600996 + 17621986601025 = 2121114^2 + 4197855^2 .

It is not a de Polignac number, because 22121111202021 - 2¹ = 22121111202019 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 22121111201985 and 22121111202003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22121111202023) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7580985 + ... + 10085313.

It is an arithmetic number, because the mean of its divisors is an integer number (759228960945).

Almost surely, 2^{22121111202021} is an apocalyptic number.

It is an amenable number.

22121111202021 is a deficient number, since it is larger than the sum of its proper divisors (14321878923339).

22121111202021 is a wasteful number, since it uses less digits than its factorization.

22121111202021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2508806 (or 2508803 counting only the distinct ones).

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

Adding to 22121111202021 its reverse (12020211112122), we get a palindrome (34141322314143).

The spelling of 22121111202021 in words is "twenty-two trillion, one hundred twenty-one billion, one hundred eleven million, two hundred two thousand, twenty-one".