21650434 has 8 divisors (see below), whose sum is σ = 34973820. Its totient is φ = 9992496.

The previous prime is 21650411. The next prime is 21650437. The reversal of 21650434 is 43405612.

It can be written as a sum of positive squares in 2 ways, for example, as 21650409 + 25 = 4653^2 + 5^2 .

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 = 21650399 and 21650408.

It is not an unprimeable number, because it can be changed into a prime (21650437) 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, 416329 + ... + 416380.

Almost surely, 2^21650434 is an apocalyptic number.

21650434 is a deficient number, since it is larger than the sum of its proper divisors (13323386).

21650434 is a wasteful number, since it uses less digits than its factorization.

21650434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 832724.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 21650434 is about 4653.0026864381. The cubic root of 21650434 is about 278.7119151384.

Subtracting from 21650434 its sum of digits (25), we obtain a square (21650409 = 4653²).

The spelling of 21650434 in words is "twenty-one million, six hundred fifty thousand, four hundred thirty-four".