21486734 has 8 divisors (see below), whose sum is σ = 32526120. Its totient is φ = 10644696.

The previous prime is 21486733. The next prime is 21486737. The reversal of 21486734 is 43768412.

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

It is a super-3 number, since 3×21486734³ (a number of 23 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21486694 and 21486703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21486733) 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, 49064 + ... + 49499.

It is an arithmetic number, because the mean of its divisors is an integer number (4065765).

Almost surely, 2^21486734 is an apocalyptic number.

21486734 is a deficient number, since it is larger than the sum of its proper divisors (11039386).

21486734 is a wasteful number, since it uses less digits than its factorization.

21486734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98674.

The product of its digits is 32256, while the sum is 35.

The square root of 21486734 is about 4635.3785174460. The cubic root of 21486734 is about 278.0076857251.

The spelling of 21486734 in words is "twenty-one million, four hundred eighty-six thousand, seven hundred thirty-four".