2102020121021 has 32 divisors (see below), whose sum is σ = 2308100106240. Its totient is φ = 1905441785856.

The previous prime is 2102020121011. The next prime is 2102020121027. The reversal of 2102020121021 is 1201210202012.

It is a cyclic number.

It is not a de Polignac number, because 2102020121021 - 2¹⁴ = 2102020104637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2102020120987 and 2102020121005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2102020121027) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 524585000 + ... + 524589006.

It is an arithmetic number, because the mean of its divisors is an integer number (72128128320).

Almost surely, 2^{2102020121021} is an apocalyptic number.

It is an amenable number.

2102020121021 is a deficient number, since it is larger than the sum of its proper divisors (206079985219).

2102020121021 is a wasteful number, since it uses less digits than its factorization.

2102020121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6413.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 2102020121021 its reverse (1201210202012), we get a palindrome (3303230323033).

The spelling of 2102020121021 in words is "two trillion, one hundred two billion, twenty million, one hundred twenty-one thousand, twenty-one".