21343955 has 4 divisors (see below), whose sum is σ = 25612752. Its totient is φ = 17075160.

The previous prime is 21343951. The next prime is 21343957. The reversal of 21343955 is 55934312.

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

It is not a de Polignac number, because 21343955 - 2² = 21343951 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21343951) 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, 2134391 + ... + 2134400.

It is an arithmetic number, because the mean of its divisors is an integer number (6403188).

Almost surely, 2^21343955 is an apocalyptic number.

21343955 is a deficient number, since it is larger than the sum of its proper divisors (4268797).

21343955 is an equidigital number, since it uses as much as digits as its factorization.

21343955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4268796.

The product of its digits is 16200, while the sum is 32.

The square root of 21343955 is about 4619.9518395758. The cubic root of 21343955 is about 277.3905311803.

The spelling of 21343955 in words is "twenty-one million, three hundred forty-three thousand, nine hundred fifty-five".