21004151529 has 4 divisors (see below), whose sum is σ = 28005535376. Its totient is φ = 14002767684.

The previous prime is 21004151507. The next prime is 21004151537. The reversal of 21004151529 is 92515140012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21004151529 - 2⁹ = 21004151017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21004151496 and 21004151505.

It is not an unprimeable number, because it can be changed into a prime (21004151579) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3500691919 + ... + 3500691924.

It is an arithmetic number, because the mean of its divisors is an integer number (7001383844).

Almost surely, 2^21004151529 is an apocalyptic number.

It is an amenable number.

21004151529 is a deficient number, since it is larger than the sum of its proper divisors (7001383847).

21004151529 is an equidigital number, since it uses as much as digits as its factorization.

21004151529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7001383846.

The product of its (nonzero) digits is 3600, while the sum is 30.

The spelling of 21004151529 in words is "twenty-one billion, four million, one hundred fifty-one thousand, five hundred twenty-nine".