21577234 has 16 divisors (see below), whose sum is σ = 37892736. Its totient is φ = 9021600.

The previous prime is 21577223. The next prime is 21577273. The reversal of 21577234 is 43277512.

It is a junction number, because it is equal to n+sod(n) for n = 21577196 and 21577205.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18222 + ... + 19369.

It is an arithmetic number, because the mean of its divisors is an integer number (2368296).

Almost surely, 2^21577234 is an apocalyptic number.

21577234 is a deficient number, since it is larger than the sum of its proper divisors (16315502).

21577234 is a wasteful number, since it uses less digits than its factorization.

21577234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37641.

The product of its digits is 11760, while the sum is 31.

The square root of 21577234 is about 4645.1301381124. The cubic root of 21577234 is about 278.3974526482.

The spelling of 21577234 in words is "twenty-one million, five hundred seventy-seven thousand, two hundred thirty-four".