21001002021022 has 4 divisors (see below), whose sum is σ = 31501503031536. Its totient is φ = 10500501010510.

The previous prime is 21001002021001. The next prime is 21001002021079. The reversal of 21001002021022 is 22012020010012.

It is a happy number.

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 = 21001002020993 and 21001002021011.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5250250505254 + ... + 5250250505257.

It is an arithmetic number, because the mean of its divisors is an integer number (7875375757884).

Almost surely, 2^{21001002021022} is an apocalyptic number.

21001002021022 is a deficient number, since it is larger than the sum of its proper divisors (10500501010514).

21001002021022 is a wasteful number, since it uses less digits than its factorization.

21001002021022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10500501010513.

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

Adding to 21001002021022 its reverse (22012020010012), we get a palindrome (43013022031034).

The spelling of 21001002021022 in words is "twenty-one trillion, one billion, two million, twenty-one thousand, twenty-two".