21254834 has 12 divisors (see below), whose sum is σ = 32308542. Its totient is φ = 10486080.

The previous prime is 21254819. The next prime is 21254839. The reversal of 21254834 is 43845212.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 18515809 + 2739025 = 4303^2 + 1655^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21254797 and 21254806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21254839) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 64049 + ... + 64379.

Almost surely, 2^21254834 is an apocalyptic number.

21254834 is a deficient number, since it is larger than the sum of its proper divisors (11053708).

21254834 is an frugal number, since it uses more digits than its factorization.

21254834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 761 (or 430 counting only the distinct ones).

The product of its digits is 7680, while the sum is 29.

The square root of 21254834 is about 4610.2965197479. The cubic root of 21254834 is about 277.0039141536.

The spelling of 21254834 in words is "twenty-one million, two hundred fifty-four thousand, eight hundred thirty-four".