2100021232021 has 2 divisors, whose sum is σ = 2100021232022. Its totient is φ = 2100021232020.

The previous prime is 2100021232003. The next prime is 2100021232079. The reversal of 2100021232021 is 1202321200012.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1933251091396 + 166770140625 = 1390414^2 + 408375^2 .

It is a cyclic number.

It is not a de Polignac number, because 2100021232021 - 2¹³ = 2100021223829 is a prime.

It is a super-3 number, since 3×2100021232021³ (a number of 38 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2100021231986 and 2100021232004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2100021232321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050010616010 + 1050010616011.

It is an arithmetic number, because the mean of its divisors is an integer number (1050010616011).

Almost surely, 2^{2100021232021} is an apocalyptic number.

It is an amenable number.

2100021232021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2100021232021 is an equidigital number, since it uses as much as digits as its factorization.

2100021232021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 2100021232021 its reverse (1202321200012), we get a palindrome (3302342432033).

The spelling of 2100021232021 in words is "two trillion, one hundred billion, twenty-one million, two hundred thirty-two thousand, twenty-one".