20001220101021 has 8 divisors (see below), whose sum is σ = 26668323207040. Its totient is φ = 13334131864512.

The previous prime is 20001220101001. The next prime is 20001220101131. The reversal of 20001220101021 is 12010102210002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20001220101021 - 2⁹ = 20001220100509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20001220100988 and 20001220101006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001220101001) 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, 66565 + ... + 6325098.

It is an arithmetic number, because the mean of its divisors is an integer number (3333540400880).

Almost surely, 2^{20001220101021} is an apocalyptic number.

It is an amenable number.

20001220101021 is a deficient number, since it is larger than the sum of its proper divisors (6667103106019).

20001220101021 is a wasteful number, since it uses less digits than its factorization.

20001220101021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7434755.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 20001220101021 its reverse (12010102210002), we get a palindrome (32011322311023).

It can be divided in two parts, 20001 and 220101021, that added together give a palindrome (220121022).

The spelling of 20001220101021 in words is "twenty trillion, one billion, two hundred twenty million, one hundred one thousand, twenty-one".