21347958 has 16 divisors (see below), whose sum is σ = 42877440. Its totient is φ = 7085736.

The previous prime is 21347957. The next prime is 21347959. The reversal of 21347958 is 85974312.

It is an interprime number because it is at equal distance from previous prime (21347957) and next prime (21347959).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21347951) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6010 + ... + 8877.

It is an arithmetic number, because the mean of its divisors is an integer number (2679840).

Almost surely, 2^21347958 is an apocalyptic number.

21347958 is an abundant number, since it is smaller than the sum of its proper divisors (21529482).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21347958 is a wasteful number, since it uses less digits than its factorization.

21347958 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15131.

The product of its digits is 60480, while the sum is 39.

The square root of 21347958 is about 4620.3850488893. The cubic root of 21347958 is about 277.4078713731.

The spelling of 21347958 in words is "twenty-one million, three hundred forty-seven thousand, nine hundred fifty-eight".