21021110022 has 48 divisors (see below), whose sum is σ = 46285940736. Its totient is φ = 6359799600.

The previous prime is 21021109979. The next prime is 21021110029. The reversal of 21021110022 is 22001112012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021110029) 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, 435163 + ... + 481049.

It is an arithmetic number, because the mean of its divisors is an integer number (964290432).

Almost surely, 2^21021110022 is an apocalyptic number.

21021110022 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 21021110022, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23142970368).

21021110022 is an abundant number, since it is smaller than the sum of its proper divisors (25264830714).

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

21021110022 is a wasteful number, since it uses less digits than its factorization.

21021110022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46545 (or 46534 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21021110022 its reverse (22001112012), we get a palindrome (43022222034).

The spelling of 21021110022 in words is "twenty-one billion, twenty-one million, one hundred ten thousand, twenty-two".