2121012201021 has 16 divisors (see below), whose sum is σ = 3232483920000. Its totient is φ = 1211832474048.

The previous prime is 2121012201019. The next prime is 2121012201043. The reversal of 2121012201021 is 1201022101212.

It is not a de Polignac number, because 2121012201021 - 2¹ = 2121012201019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121012206021) 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, 7121346 + ... + 7413203.

It is an arithmetic number, because the mean of its divisors is an integer number (202030245000).

Almost surely, 2^{2121012201021} is an apocalyptic number.

2121012201021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2121012201021 is a deficient number, since it is larger than the sum of its proper divisors (1111471718979).

2121012201021 is a wasteful number, since it uses less digits than its factorization.

2121012201021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14541508.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 2121012201021 its reverse (1201022101212), we get a palindrome (3322034302233).

The spelling of 2121012201021 in words is "two trillion, one hundred twenty-one billion, twelve million, two hundred one thousand, twenty-one".