21010100022 has 48 divisors (see below), whose sum is σ = 49463531520. Its totient is φ = 6420740400.

The previous prime is 21010100021. The next prime is 21010100039. The reversal of 21010100022 is 22000101012.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 21010099977 and 21010100013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010100021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 980254 + ... + 1001457.

It is an arithmetic number, because the mean of its divisors is an integer number (1030490240).

Almost surely, 2^21010100022 is an apocalyptic number.

21010100022 is an abundant number, since it is smaller than the sum of its proper divisors (28453431498).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21010100022 is a wasteful number, since it uses less digits than its factorization.

21010100022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1981769 (or 1981766 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 21010100022 its reverse (22000101012), we get a palindrome (43010201034).

The spelling of 21010100022 in words is "twenty-one billion, ten million, one hundred thousand, twenty-two".