21623934 has 8 divisors (see below), whose sum is σ = 43247880. Its totient is φ = 7207976.

The previous prime is 21623911. The next prime is 21623939. The reversal of 21623934 is 43932612.

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

21623934 is an admirable number.

It is a super-3 number, since 3×21623934³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21623939) 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, 1801989 + ... + 1802000.

It is an arithmetic number, because the mean of its divisors is an integer number (5405985).

Almost surely, 2^21623934 is an apocalyptic number.

21623934 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.

21623934 is a wasteful number, since it uses less digits than its factorization.

21623934 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3603994.

The product of its digits is 7776, while the sum is 30.

The square root of 21623934 is about 4650.1541909920. The cubic root of 21623934 is about 278.5981548135.

The spelling of 21623934 in words is "twenty-one million, six hundred twenty-three thousand, nine hundred thirty-four".