2102022100021 has 2 divisors, whose sum is σ = 2102022100022. Its totient is φ = 2102022100020.

The previous prime is 2102022099973. The next prime is 2102022100051. The reversal of 2102022100021 is 1200012202012.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1907951013796 + 194071086225 = 1381286^2 + 440535^2 .

It is a cyclic number.

It is not a de Polignac number, because 2102022100021 - 2⁹ = 2102022099509 is a prime.

It is a super-3 number, since 3×2102022100021³ (a number of 38 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2102022099974 and 2102022100010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2102022100051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1051011050010 + 1051011050011.

It is an arithmetic number, because the mean of its divisors is an integer number (1051011050011).

Almost surely, 2^{2102022100021} is an apocalyptic number.

It is an amenable number.

2102022100021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2102022100021 is an equidigital number, since it uses as much as digits as its factorization.

2102022100021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 2102022100021 its reverse (1200012202012), we get a palindrome (3302034302033).

The spelling of 2102022100021 in words is "two trillion, one hundred two billion, twenty-two million, one hundred thousand, twenty-one".