220120001220021 has 32 divisors (see below), whose sum is σ = 339982743260160. Its totient is φ = 124080634722816.

The previous prime is 220120001219999. The next prime is 220120001220029. The reversal of 220120001220021 is 120022100021022.

It is not a de Polignac number, because 220120001220021 - 2¹⁴ = 220120001203637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220120001220029) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 175369551 + ... + 176620268.

It is an arithmetic number, because the mean of its divisors is an integer number (10624460726880).

Almost surely, 2^{220120001220021} is an apocalyptic number.

220120001220021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

220120001220021 is a deficient number, since it is larger than the sum of its proper divisors (119862742040139).

220120001220021 is a wasteful number, since it uses less digits than its factorization.

220120001220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351990233.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 220120001220021 its reverse (120022100021022), we get a palindrome (340142101241043).

The spelling of 220120001220021 in words is "two hundred twenty trillion, one hundred twenty billion, one million, two hundred twenty thousand, twenty-one".