21309501029 has 8 divisors (see below), whose sum is σ = 22298234112. Its totient is φ = 20339601120.

The previous prime is 21309501023. The next prime is 21309501061. The reversal of 21309501029 is 92010590312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21309501029 - 2²⁰ = 21308452453 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21309500986 and 21309501004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21309501023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4705979 + ... + 4710504.

It is an arithmetic number, because the mean of its divisors is an integer number (2787279264).

Almost surely, 2^21309501029 is an apocalyptic number.

It is an amenable number.

21309501029 is a deficient number, since it is larger than the sum of its proper divisors (988733083).

21309501029 is an equidigital number, since it uses as much as digits as its factorization.

21309501029 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9416587.

The product of its (nonzero) digits is 4860, while the sum is 32.

The spelling of 21309501029 in words is "twenty-one billion, three hundred nine million, five hundred one thousand, twenty-nine".