21223132109 has 2 divisors, whose sum is σ = 21223132110. Its totient is φ = 21223132108.

The previous prime is 21223132057. The next prime is 21223132123. The reversal of 21223132109 is 90123132212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20966171209 + 256960900 = 144797^2 + 16030^2 .

It is a cyclic number.

It is not a de Polignac number, because 21223132109 - 2¹⁶ = 21223066573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21223132199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611566054 + 10611566055.

It is an arithmetic number, because the mean of its divisors is an integer number (10611566055).

Almost surely, 2^21223132109 is an apocalyptic number.

It is an amenable number.

21223132109 is a deficient number, since it is larger than the sum of its proper divisors (1).

21223132109 is an equidigital number, since it uses as much as digits as its factorization.

21223132109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 26.

The spelling of 21223132109 in words is "twenty-one billion, two hundred twenty-three million, one hundred thirty-two thousand, one hundred nine".