21234986 has 8 divisors (see below), whose sum is σ = 31881060. Its totient is φ = 10607968.

The previous prime is 21234973. The next prime is 21235001. The reversal of 21234986 is 68943212.

It can be written as a sum of positive squares in 2 ways, for example, as 20079361 + 1155625 = 4481^2 + 1075^2 .

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, 1541 + ... + 6696.

Almost surely, 2^21234986 is an apocalyptic number.

21234986 is a deficient number, since it is larger than the sum of its proper divisors (10646074).

21234986 is a wasteful number, since it uses less digits than its factorization.

21234986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9528.

The product of its digits is 20736, while the sum is 35.

The square root of 21234986 is about 4608.1434439479. The cubic root of 21234986 is about 276.9176641907.

The spelling of 21234986 in words is "twenty-one million, two hundred thirty-four thousand, nine hundred eighty-six".