220121211100021 has 8 divisors (see below), whose sum is σ = 274436834618304. Its totient is φ = 171523021636320.

The previous prime is 220121211099929. The next prime is 220121211100039. The reversal of 220121211100021 is 120001112121022.

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 220121211100021 - 2²³ = 220121202711413 is a prime.

It is a super-2 number, since 2×220121211100021² (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 = 220121211099968 and 220121211100004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220121211100621) 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, 1429358513560 + ... + 1429358513713.

It is an arithmetic number, because the mean of its divisors is an integer number (34304604327288).

Almost surely, 2^{220121211100021} is an apocalyptic number.

It is an amenable number.

220121211100021 is a deficient number, since it is larger than the sum of its proper divisors (54315623518283).

220121211100021 is a wasteful number, since it uses less digits than its factorization.

220121211100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2858717027291.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 220121211100021 its reverse (120001112121022), we get a palindrome (340122323221043).

The spelling of 220121211100021 in words is "two hundred twenty trillion, one hundred twenty-one billion, two hundred eleven million, one hundred thousand, twenty-one".