21022212104 has 128 divisors (see below), whose sum is σ = 44743104000. Its totient is φ = 9200894976.

The previous prime is 21022212103. The next prime is 21022212109. The reversal of 21022212104 is 40121222012.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is not an unprimeable number, because it can be changed into a prime (21022212103) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38431559 + ... + 38432105.

It is an arithmetic number, because the mean of its divisors is an integer number (349555500).

Almost surely, 2^21022212104 is an apocalyptic number.

It is an amenable number.

21022212104 is an abundant number, since it is smaller than the sum of its proper divisors (23720891896).

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

21022212104 is a wasteful number, since it uses less digits than its factorization.

21022212104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 835 (or 831 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21022212104 its reverse (40121222012), we get a palindrome (61143434116).

The spelling of 21022212104 in words is "twenty-one billion, twenty-two million, two hundred twelve thousand, one hundred four".