2210121122021 has 4 divisors (see below), whose sum is σ = 2230397462700. Its totient is φ = 2189844781344.

The previous prime is 2210121121987. The next prime is 2210121122071. The reversal of 2210121122021 is 1202211210122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 929238160900 + 1280882961121 = 963970^2 + 1131761^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2210121122021 is a prime.

It is a super-2 number, since 2×2210121122021² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2210121122071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10138170176 + ... + 10138170393.

It is an arithmetic number, because the mean of its divisors is an integer number (557599365675).

Almost surely, 2^{2210121122021} is an apocalyptic number.

It is an amenable number.

2210121122021 is a deficient number, since it is larger than the sum of its proper divisors (20276340679).

2210121122021 is a wasteful number, since it uses less digits than its factorization.

2210121122021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20276340678.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 2210121122021 its reverse (1202211210122), we get a palindrome (3412332332143).

The spelling of 2210121122021 in words is "two trillion, two hundred ten billion, one hundred twenty-one million, one hundred twenty-two thousand, twenty-one".