2120202120021 has 8 divisors (see below), whose sum is σ = 2892678861600. Its totient is φ = 1380596729232.

The previous prime is 2120202120019. The next prime is 2120202120067. The reversal of 2120202120021 is 1200212020212.

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

It is not a de Polignac number, because 2120202120021 - 2¹ = 2120202120019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2120202120011) 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, 8217837546 + ... + 8217837803.

It is an arithmetic number, because the mean of its divisors is an integer number (361584857700).

Almost surely, 2^{2120202120021} is an apocalyptic number.

It is an amenable number.

2120202120021 is a deficient number, since it is larger than the sum of its proper divisors (772476741579).

2120202120021 is a wasteful number, since it uses less digits than its factorization.

2120202120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16435675395.

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

Adding to 2120202120021 its reverse (1200212020212), we get a palindrome (3320414140233).

The spelling of 2120202120021 in words is "two trillion, one hundred twenty billion, two hundred two million, one hundred twenty thousand, twenty-one".