21001001002022 has 4 divisors (see below), whose sum is σ = 31501501503036. Its totient is φ = 10500500501010.

The previous prime is 21001001002013. The next prime is 21001001002031. The reversal of 21001001002022 is 22020010010012.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (21001001002013) and next prime (21001001002031).

It is a junction number, because it is equal to n+sod(n) for n = 21001001001994 and 21001001002012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5250250250504 + ... + 5250250250507.

It is an arithmetic number, because the mean of its divisors is an integer number (7875375375759).

Almost surely, 2^{21001001002022} is an apocalyptic number.

21001001002022 is a deficient number, since it is larger than the sum of its proper divisors (10500500501014).

21001001002022 is a wasteful number, since it uses less digits than its factorization.

21001001002022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10500500501013.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21001001002022 its reverse (22020010010012), we get a palindrome (43021011012034).

The spelling of 21001001002022 in words is "twenty-one trillion, one billion, one million, two thousand, twenty-two".