220121020021 has 16 divisors (see below), whose sum is σ = 252872089600. Its totient is φ = 187696563120.

The previous prime is 220121019997. The next prime is 220121020033. The reversal of 220121020021 is 120020121022.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 220121020021 - 2²¹ = 220118922869 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220121019983 and 220121020010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (223121020021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14294236 + ... + 14309626.

It is an arithmetic number, because the mean of its divisors is an integer number (15804505600).

Almost surely, 2^220121020021 is an apocalyptic number.

It is an amenable number.

220121020021 is a deficient number, since it is larger than the sum of its proper divisors (32751069579).

220121020021 is a wasteful number, since it uses less digits than its factorization.

220121020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25864.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 220121020021 its reverse (120020121022), we get a palindrome (340141141043).

The spelling of 220121020021 in words is "two hundred twenty billion, one hundred twenty-one million, twenty thousand, twenty-one".