21537074 has 8 divisors (see below), whose sum is σ = 34790700. Its totient is φ = 9940176.

The previous prime is 21537073. The next prime is 21537091. The reversal of 21537074 is 47073512.

It can be written as a sum of positive squares in 2 ways, for example, as 16443025 + 5094049 = 4055^2 + 2257^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21537073) 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, 414149 + ... + 414200.

Almost surely, 2^21537074 is an apocalyptic number.

21537074 is a deficient number, since it is larger than the sum of its proper divisors (13253626).

21537074 is a wasteful number, since it uses less digits than its factorization.

21537074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 828364.

The product of its (nonzero) digits is 5880, while the sum is 29.

The square root of 21537074 is about 4640.8053180456. The cubic root of 21537074 is about 278.2246256568.

The spelling of 21537074 in words is "twenty-one million, five hundred thirty-seven thousand, seventy-four".