21034505395 has 4 divisors (see below), whose sum is σ = 25241406480. Its totient is φ = 16827604312.

The previous prime is 21034505341. The next prime is 21034505411. The reversal of 21034505395 is 59350543012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21034505395 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2103450535 + ... + 2103450544.

It is an arithmetic number, because the mean of its divisors is an integer number (6310351620).

Almost surely, 2^21034505395 is an apocalyptic number.

21034505395 is a deficient number, since it is larger than the sum of its proper divisors (4206901085).

21034505395 is an equidigital number, since it uses as much as digits as its factorization.

21034505395 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4206901084.

The product of its (nonzero) digits is 81000, while the sum is 37.

The spelling of 21034505395 in words is "twenty-one billion, thirty-four million, five hundred five thousand, three hundred ninety-five".