210121002021021 has 64 divisors (see below), whose sum is σ = 366016769008128. Its totient is φ = 104050709250048.

The previous prime is 210121002021001. The next prime is 210121002021097. The reversal of 210121002021021 is 120120200121012.

It is not a de Polignac number, because 210121002021021 - 2⁷ = 210121002020893 is a prime.

It is a super-2 number, since 2×210121002021021² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210121002021001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 55178860 + ... + 58863813.

It is an arithmetic number, because the mean of its divisors is an integer number (5719012015752).

Almost surely, 2^{210121002021021} is an apocalyptic number.

210121002021021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

210121002021021 is a deficient number, since it is larger than the sum of its proper divisors (155895766987107).

210121002021021 is a wasteful number, since it uses less digits than its factorization.

210121002021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114043110.

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

Adding to 210121002021021 its reverse (120120200121012), we get a palindrome (330241202142033).

The spelling of 210121002021021 in words is "two hundred ten trillion, one hundred twenty-one billion, two million, twenty-one thousand, twenty-one".