102101011021 has 2 divisors, whose sum is σ = 102101011022. Its totient is φ = 102101011020.

The previous prime is 102101010959. The next prime is 102101011057. The reversal of 102101011021 is 120110101201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 102099420900 + 1590121 = 319530^2 + 1261^2 .

It is a cyclic number.

It is not a de Polignac number, because 102101011021 - 2¹⁷ = 102100879949 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 102101010989 and 102101011007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102101017021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51050505510 + 51050505511.

It is an arithmetic number, because the mean of its divisors is an integer number (51050505511).

Almost surely, 2^102101011021 is an apocalyptic number.

It is an amenable number.

102101011021 is a deficient number, since it is larger than the sum of its proper divisors (1).

102101011021 is an equidigital number, since it uses as much as digits as its factorization.

102101011021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 102101011021 its reverse (120110101201), we get a palindrome (222211112222).

The spelling of 102101011021 in words is "one hundred two billion, one hundred one million, eleven thousand, twenty-one".