21343954 has 16 divisors (see below), whose sum is σ = 35167680. Its totient is φ = 9670320.

The previous prime is 21343951. The next prime is 21343957. The reversal of 21343954 is 45934312.

It is an interprime number because it is at equal distance from previous prime (21343951) and next prime (21343957).

It is not an unprimeable number, because it can be changed into a prime (21343951) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 11337 + ... + 13084.

It is an arithmetic number, because the mean of its divisors is an integer number (2197980).

Almost surely, 2^21343954 is an apocalyptic number.

21343954 is a deficient number, since it is larger than the sum of its proper divisors (13823726).

21343954 is a wasteful number, since it uses less digits than its factorization.

21343954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24465.

The product of its digits is 12960, while the sum is 31.

The square root of 21343954 is about 4619.9517313496. The cubic root of 21343954 is about 277.3905268482.

The spelling of 21343954 in words is "twenty-one million, three hundred forty-three thousand, nine hundred fifty-four".