102102022021 has 4 divisors (see below), whose sum is σ = 103005579852. Its totient is φ = 101198464192.

The previous prime is 102102021919. The next prime is 102102022037. The reversal of 102102022021 is 120220201201.

It is a happy number.

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 6874233921 + 95227788100 = 82911^2 + 308590^2 .

It is a cyclic number.

It is not a de Polignac number, because 102102022021 - 2⁹ = 102102021509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 102102021992 and 102102022010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102102020021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 451778746 + ... + 451778971.

It is an arithmetic number, because the mean of its divisors is an integer number (25751394963).

Almost surely, 2^102102022021 is an apocalyptic number.

It is an amenable number.

102102022021 is a deficient number, since it is larger than the sum of its proper divisors (903557831).

102102022021 is an equidigital number, since it uses as much as digits as its factorization.

102102022021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 903557830.

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

Adding to 102102022021 its reverse (120220201201), we get a palindrome (222322223222).

The spelling of 102102022021 in words is "one hundred two billion, one hundred two million, twenty-two thousand, twenty-one".