21437734 has 8 divisors (see below), whose sum is σ = 32840928. Its totient is φ = 10490760.

The previous prime is 21437723. The next prime is 21437747. The reversal of 21437734 is 43773412.

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

It is a junction number, because it is equal to n+sod(n) for n = 21437696 and 21437705.

It is a congruent number.

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, 113937 + ... + 114124.

It is an arithmetic number, because the mean of its divisors is an integer number (4105116).

Almost surely, 2^21437734 is an apocalyptic number.

21437734 is a deficient number, since it is larger than the sum of its proper divisors (11403194).

21437734 is a wasteful number, since it uses less digits than its factorization.

21437734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228110.

The product of its digits is 14112, while the sum is 31.

The square root of 21437734 is about 4630.0900639188. The cubic root of 21437734 is about 277.7961948441.

The spelling of 21437734 in words is "twenty-one million, four hundred thirty-seven thousand, seven hundred thirty-four".