21000223122 has 32 divisors (see below), whose sum is σ = 42673105152. Its totient is φ = 6888189264.

The previous prime is 21000223121. The next prime is 21000223147. The reversal of 21000223122 is 22132200012.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21000223121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 353113 + ... + 408275.

It is an arithmetic number, because the mean of its divisors is an integer number (1333534536).

Almost surely, 2^21000223122 is an apocalyptic number.

21000223122 is an abundant number, since it is smaller than the sum of its proper divisors (21672882030).

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

21000223122 is a wasteful number, since it uses less digits than its factorization.

21000223122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56182.

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 21000223122 its reverse (22132200012), we get a palindrome (43132423134).

The spelling of 21000223122 in words is "twenty-one billion, two hundred twenty-three thousand, one hundred twenty-two".