21796129 has 2 divisors, whose sum is σ = 21796130. Its totient is φ = 21796128.

The previous prime is 21796067. The next prime is 21796163. The reversal of 21796129 is 92169712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12061729 + 9734400 = 3473^2 + 3120^2 .

It is a cyclic number.

It is not a de Polignac number, because 21796129 - 2¹⁹ = 21271841 is a prime.

It is not a weakly prime, because it can be changed into another prime (21796169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10898064 + 10898065.

It is an arithmetic number, because the mean of its divisors is an integer number (10898065).

Almost surely, 2^21796129 is an apocalyptic number.

It is an amenable number.

21796129 is a deficient number, since it is larger than the sum of its proper divisors (1).

21796129 is an equidigital number, since it uses as much as digits as its factorization.

21796129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13608, while the sum is 37.

The square root of 21796129 is about 4668.6324550129. The cubic root of 21796129 is about 279.3357083977.

The spelling of 21796129 in words is "twenty-one million, seven hundred ninety-six thousand, one hundred twenty-nine".