21147634 has 8 divisors (see below), whose sum is σ = 32168448. Its totient is φ = 10424820.

The previous prime is 21147617. The next prime is 21147647. The reversal of 21147634 is 43674112.

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, 74322 + ... + 74605.

It is an arithmetic number, because the mean of its divisors is an integer number (4021056).

Almost surely, 2^21147634 is an apocalyptic number.

21147634 is a deficient number, since it is larger than the sum of its proper divisors (11020814).

21147634 is a wasteful number, since it uses less digits than its factorization.

21147634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149000.

The product of its digits is 4032, while the sum is 28.

The square root of 21147634 is about 4598.6556731288. The cubic root of 21147634 is about 276.5374338779.

The spelling of 21147634 in words is "twenty-one million, one hundred forty-seven thousand, six hundred thirty-four".