21337930 has 8 divisors (see below), whose sum is σ = 38408292. Its totient is φ = 8535168.

The previous prime is 21337913. The next prime is 21337957. The reversal of 21337930 is 3973312.

It can be written as a sum of positive squares in 2 ways, for example, as 20820969 + 516961 = 4563^2 + 719^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1066887 + ... + 1066906.

Almost surely, 2^21337930 is an apocalyptic number.

21337930 is a deficient number, since it is larger than the sum of its proper divisors (17070362).

21337930 is a wasteful number, since it uses less digits than its factorization.

21337930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2133800.

The product of its (nonzero) digits is 3402, while the sum is 28.

The square root of 21337930 is about 4619.2997304786. The cubic root of 21337930 is about 277.3644280013.

The spelling of 21337930 in words is "twenty-one million, three hundred thirty-seven thousand, nine hundred thirty".