2100021210061 has 2 divisors, whose sum is σ = 2100021210062. Its totient is φ = 2100021210060.

The previous prime is 2100021209971. The next prime is 2100021210073. The reversal of 2100021210061 is 1600121200012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1545322472100 + 554698737961 = 1243110^2 + 744781^2 .

It is a cyclic number.

It is not a de Polignac number, because 2100021210061 - 2⁹ = 2100021209549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2100021216061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050010605030 + 1050010605031.

It is an arithmetic number, because the mean of its divisors is an integer number (1050010605031).

Almost surely, 2^{2100021210061} is an apocalyptic number.

It is an amenable number.

2100021210061 is a deficient number, since it is larger than the sum of its proper divisors (1).

2100021210061 is an equidigital number, since it uses as much as digits as its factorization.

2100021210061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 2100021210061 its reverse (1600121200012), we get a palindrome (3700142410073).

The spelling of 2100021210061 in words is "two trillion, one hundred billion, twenty-one million, two hundred ten thousand, sixty-one".