21346998 has 8 divisors (see below), whose sum is σ = 42694008. Its totient is φ = 7115664.

The previous prime is 21346993. The next prime is 21347017. The reversal of 21346998 is 89964312.

It is a sphenic number, since it is the product of 3 distinct primes.

21346998 is an admirable number.

It is a super-2 number, since 2×21346998² = 911388647224008, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21346991) 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, 1778911 + ... + 1778922.

It is an arithmetic number, because the mean of its divisors is an integer number (5336751).

Almost surely, 2^21346998 is an apocalyptic number.

21346998 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21346998 is a wasteful number, since it uses less digits than its factorization.

21346998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3557838.

The product of its digits is 93312, while the sum is 42.

The square root of 21346998 is about 4620.2811602759. The cubic root of 21346998 is about 277.4037130434.

The spelling of 21346998 in words is "twenty-one million, three hundred forty-six thousand, nine hundred ninety-eight".