21531332035 has 8 divisors (see below), whose sum is σ = 25885360656. Its totient is φ = 17193224160.

The previous prime is 21531332023. The next prime is 21531332047. The reversal of 21531332035 is 53023313512.

It is an interprime number because it is at equal distance from previous prime (21531332023) and next prime (21531332047).

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

It is not a de Polignac number, because 21531332035 - 2¹⁹ = 21530807747 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21531331994 and 21531332012.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3977209 + ... + 3982618.

It is an arithmetic number, because the mean of its divisors is an integer number (3235670082).

Almost surely, 2^21531332035 is an apocalyptic number.

21531332035 is a deficient number, since it is larger than the sum of its proper divisors (4354028621).

21531332035 is an equidigital number, since it uses as much as digits as its factorization.

21531332035 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7960373.

The product of its (nonzero) digits is 8100, while the sum is 28.

Adding to 21531332035 its reverse (53023313512), we get a palindrome (74554645547).

The spelling of 21531332035 in words is "twenty-one billion, five hundred thirty-one million, three hundred thirty-two thousand, thirty-five".