21492148829 has 2 divisors, whose sum is σ = 21492148830. Its totient is φ = 21492148828.

The previous prime is 21492148807. The next prime is 21492148859. The reversal of 21492148829 is 92884129412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11041175929 + 10450972900 = 105077^2 + 102230^2 .

It is a cyclic number.

It is not a de Polignac number, because 21492148829 - 2²⁸ = 21223713373 is a prime.

It is a super-2 number, since 2×21492148829² (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 (21492148859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10746074414 + 10746074415.

It is an arithmetic number, because the mean of its divisors is an integer number (10746074415).

Almost surely, 2^21492148829 is an apocalyptic number.

It is an amenable number.

21492148829 is a deficient number, since it is larger than the sum of its proper divisors (1).

21492148829 is an equidigital number, since it uses as much as digits as its factorization.

21492148829 is an evil number, because the sum of its binary digits is even.

The product of its digits is 663552, while the sum is 50.

The spelling of 21492148829 in words is "twenty-one billion, four hundred ninety-two million, one hundred forty-eight thousand, eight hundred twenty-nine".