21222423149 has 2 divisors, whose sum is σ = 21222423150. Its totient is φ = 21222423148.

The previous prime is 21222423143. The next prime is 21222423223. The reversal of 21222423149 is 94132422212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18141396100 + 3081027049 = 134690^2 + 55507^2 .

It is a cyclic number.

It is not a de Polignac number, because 21222423149 - 2¹⁶ = 21222357613 is a prime.

It is a super-2 number, since 2×21222423149² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21222423143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611211574 + 10611211575.

It is an arithmetic number, because the mean of its divisors is an integer number (10611211575).

Almost surely, 2^21222423149 is an apocalyptic number.

It is an amenable number.

21222423149 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222423149 is an equidigital number, since it uses as much as digits as its factorization.

21222423149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824, while the sum is 32.

The spelling of 21222423149 in words is "twenty-one billion, two hundred twenty-two million, four hundred twenty-three thousand, one hundred forty-nine".