21322145122 has 4 divisors (see below), whose sum is σ = 31983217686. Its totient is φ = 10661072560.

The previous prime is 21322145111. The next prime is 21322145129. The reversal of 21322145122 is 22154122312.

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., 21214213801 + 107931321 = 145651^2 + 10389^2 .

It is not an unprimeable number, because it can be changed into a prime (21322145129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5330536279 + ... + 5330536282.

Almost surely, 2^21322145122 is an apocalyptic number.

21322145122 is a deficient number, since it is larger than the sum of its proper divisors (10661072564).

21322145122 is a wasteful number, since it uses less digits than its factorization.

21322145122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10661072563.

The product of its digits is 1920, while the sum is 25.

Adding to 21322145122 its reverse (22154122312), we get a palindrome (43476267434).

The spelling of 21322145122 in words is "twenty-one billion, three hundred twenty-two million, one hundred forty-five thousand, one hundred twenty-two".