21002020102022 has 4 divisors (see below), whose sum is σ = 31503030153036. Its totient is φ = 10501010051010.

The previous prime is 21002020102001. The next prime is 21002020102027. The reversal of 21002020102022 is 22020102020012.

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

It is a junction number, because it is equal to n+sod(n) for n = 21002020101988 and 21002020102006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002020102027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5250505025504 + ... + 5250505025507.

It is an arithmetic number, because the mean of its divisors is an integer number (7875757538259).

Almost surely, 2^{21002020102022} is an apocalyptic number.

21002020102022 is a deficient number, since it is larger than the sum of its proper divisors (10501010051014).

21002020102022 is a wasteful number, since it uses less digits than its factorization.

21002020102022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10501010051013.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 21002020102022 its reverse (22020102020012), we get a palindrome (43022122122034).

The spelling of 21002020102022 in words is "twenty-one trillion, two billion, twenty million, one hundred two thousand, twenty-two".