220212202121021 has 4 divisors (see below), whose sum is σ = 240231493222944. Its totient is φ = 200192911019100.

The previous prime is 220212202120997. The next prime is 220212202121039. The reversal of 220212202121021 is 120121202212022.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 220212202121021 - 2²⁶ = 220212135012157 is a prime.

It is a super-2 number, since 2×220212202121021² (a number of 29 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 = 220212202120984 and 220212202121002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220212202121081) 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, 10009645550945 + ... + 10009645550966.

It is an arithmetic number, because the mean of its divisors is an integer number (60057873305736).

Almost surely, 2^{220212202121021} is an apocalyptic number.

It is an amenable number.

220212202121021 is a deficient number, since it is larger than the sum of its proper divisors (20019291101923).

220212202121021 is a wasteful number, since it uses less digits than its factorization.

220212202121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20019291101922.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 220212202121021 its reverse (120121202212022), we get a palindrome (340333404333043).

The spelling of 220212202121021 in words is "two hundred twenty trillion, two hundred twelve billion, two hundred two million, one hundred twenty-one thousand, twenty-one".