21349495 has 4 divisors (see below), whose sum is σ = 25619400. Its totient is φ = 17079592.

The previous prime is 21349459. The next prime is 21349511. The reversal of 21349495 is 59494312.

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-21349495 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2134945 + ... + 2134954.

It is an arithmetic number, because the mean of its divisors is an integer number (6404850).

Almost surely, 2^21349495 is an apocalyptic number.

21349495 is a deficient number, since it is larger than the sum of its proper divisors (4269905).

21349495 is an equidigital number, since it uses as much as digits as its factorization.

21349495 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4269904.

The product of its digits is 38880, while the sum is 37.

The square root of 21349495 is about 4620.5513740245. The cubic root of 21349495 is about 277.4145287728.

The spelling of 21349495 in words is "twenty-one million, three hundred forty-nine thousand, four hundred ninety-five".