21100021022 has 8 divisors (see below), whose sum is σ = 31705657200. Its totient is φ = 10531468624.

The previous prime is 21100021021. The next prime is 21100021027. The reversal of 21100021022 is 22012000112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21100020994 and 21100021012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100021021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9269522 + ... + 9271797.

It is an arithmetic number, because the mean of its divisors is an integer number (3963207150).

Almost surely, 2^21100021022 is an apocalyptic number.

21100021022 is a deficient number, since it is larger than the sum of its proper divisors (10605636178).

21100021022 is a wasteful number, since it uses less digits than its factorization.

21100021022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18541890.

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

Adding to 21100021022 its reverse (22012000112), we get a palindrome (43112021134).

The spelling of 21100021022 in words is "twenty-one billion, one hundred million, twenty-one thousand, twenty-two".