2021120220021 has 24 divisors (see below), whose sum is σ = 3186188865504. Its totient is φ = 1135992624480.

The previous prime is 2021120219977. The next prime is 2021120220029. The reversal of 2021120220021 is 1200220211202.

It is not a de Polignac number, because 2021120220021 - 2⁶ = 2021120219957 is a prime.

It is a super-3 number, since 3×2021120220021³ (a number of 38 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021120220029) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 112688715 + ... + 112706648.

It is an arithmetic number, because the mean of its divisors is an integer number (132757869396).

Almost surely, 2^{2021120220021} is an apocalyptic number.

2021120220021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2021120220021 is a deficient number, since it is larger than the sum of its proper divisors (1165068645483).

2021120220021 is a wasteful number, since it uses less digits than its factorization.

2021120220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225395441 (or 225395434 counting only the distinct ones).

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

Adding to 2021120220021 its reverse (1200220211202), we get a palindrome (3221340431223).

The spelling of 2021120220021 in words is "two trillion, twenty-one billion, one hundred twenty million, two hundred twenty thousand, twenty-one".