21213233122 has 4 divisors (see below), whose sum is σ = 31819849686. Its totient is φ = 10606616560.

The previous prime is 21213233081. The next prime is 21213233177. The reversal of 21213233122 is 22133231212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 20059340161 + 1153892961 = 141631^2 + 33969^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21213233093 and 21213233102.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5303308279 + ... + 5303308282.

Almost surely, 2^21213233122 is an apocalyptic number.

21213233122 is a deficient number, since it is larger than the sum of its proper divisors (10606616564).

21213233122 is a wasteful number, since it uses less digits than its factorization.

21213233122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10606616563.

The product of its digits is 864, while the sum is 22.

Adding to 21213233122 its reverse (22133231212), we get a palindrome (43346464334).

The spelling of 21213233122 in words is "twenty-one billion, two hundred thirteen million, two hundred thirty-three thousand, one hundred twenty-two".