102022021021 has 4 divisors (see below), whose sum is σ = 102051742492. Its totient is φ = 101992299552.

The previous prime is 102022021019. The next prime is 102022021043. The reversal of 102022021021 is 120120220201.

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 39366924921 + 62655096100 = 198411^2 + 250310^2 .

It is a cyclic number.

It is not a de Polignac number, because 102022021021 - 2¹ = 102022021019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102022020992 and 102022021010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102022021051) 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, 14855586 + ... + 14862451.

It is an arithmetic number, because the mean of its divisors is an integer number (25512935623).

Almost surely, 2^102022021021 is an apocalyptic number.

It is an amenable number.

102022021021 is a deficient number, since it is larger than the sum of its proper divisors (29721471).

102022021021 is an equidigital number, since it uses as much as digits as its factorization.

102022021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29721470.

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

Adding to 102022021021 its reverse (120120220201), we get a palindrome (222142241222).

The spelling of 102022021021 in words is "one hundred two billion, twenty-two million, twenty-one thousand, twenty-one".