21534329 has 2 divisors, whose sum is σ = 21534330. Its totient is φ = 21534328.

The previous prime is 21534323. The next prime is 21534349. The reversal of 21534329 is 92343512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13542400 + 7991929 = 3680^2 + 2827^2 .

It is a cyclic number.

It is not a de Polignac number, because 21534329 - 2¹² = 21530233 is a prime.

It is not a weakly prime, because it can be changed into another prime (21534323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10767164 + 10767165.

It is an arithmetic number, because the mean of its divisors is an integer number (10767165).

Almost surely, 2^21534329 is an apocalyptic number.

It is an amenable number.

21534329 is a deficient number, since it is larger than the sum of its proper divisors (1).

21534329 is an equidigital number, since it uses as much as digits as its factorization.

21534329 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 29.

The square root of 21534329 is about 4640.5095625373. The cubic root of 21534329 is about 278.2128048148.

The spelling of 21534329 in words is "twenty-one million, five hundred thirty-four thousand, three hundred twenty-nine".