102011200021021 has 4 divisors (see below), whose sum is σ = 102012221939292. Its totient is φ = 102010178102752.

The previous prime is 102011200020997. The next prime is 102011200021051. The reversal of 102011200021021 is 120120002110201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 65290763272900 + 36720436748121 = 8080270^2 + 6059739^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102011200021021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102011200020992 and 102011200021010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102011200021051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 510809386 + ... + 511009051.

It is an arithmetic number, because the mean of its divisors is an integer number (25503055484823).

Almost surely, 2^{102011200021021} is an apocalyptic number.

It is an amenable number.

102011200021021 is a deficient number, since it is larger than the sum of its proper divisors (1021918271).

102011200021021 is an equidigital number, since it uses as much as digits as its factorization.

102011200021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1021918270.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 102011200021021 its reverse (120120002110201), we get a palindrome (222131202131222).

The spelling of 102011200021021 in words is "one hundred two trillion, eleven billion, two hundred million, twenty-one thousand, twenty-one".