21436948 has 12 divisors (see below), whose sum is σ = 40400500. Its totient is φ = 9893952.

The previous prime is 21436939. The next prime is 21436951. The reversal of 21436948 is 84963412.

It can be written as a sum of positive squares in 2 ways, for example, as 1258884 + 20178064 = 1122^2 + 4492^2 .

It is a congruent number.

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, 206073 + ... + 206176.

Almost surely, 2^21436948 is an apocalyptic number.

It is an amenable number.

21436948 is a deficient number, since it is larger than the sum of its proper divisors (18963552).

21436948 is a wasteful number, since it uses less digits than its factorization.

21436948 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412266 (or 412264 counting only the distinct ones).

The product of its digits is 41472, while the sum is 37.

The square root of 21436948 is about 4630.0051835824. The cubic root of 21436948 is about 277.7927997328.

The spelling of 21436948 in words is "twenty-one million, four hundred thirty-six thousand, nine hundred forty-eight".