21231202529 has 2 divisors, whose sum is σ = 21231202530. Its totient is φ = 21231202528.

The previous prime is 21231202481. The next prime is 21231202567. The reversal of 21231202529 is 92520213212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20397552400 + 833650129 = 142820^2 + 28873^2 .

It is a cyclic number.

It is not a de Polignac number, because 21231202529 - 2³² = 16936235233 is a prime.

It is not a weakly prime, because it can be changed into another prime (21231202579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10615601264 + 10615601265.

It is an arithmetic number, because the mean of its divisors is an integer number (10615601265).

Almost surely, 2^21231202529 is an apocalyptic number.

It is an amenable number.

21231202529 is a deficient number, since it is larger than the sum of its proper divisors (1).

21231202529 is an equidigital number, since it uses as much as digits as its factorization.

21231202529 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 29.

The spelling of 21231202529 in words is "twenty-one billion, two hundred thirty-one million, two hundred two thousand, five hundred twenty-nine".