21236954 has 4 divisors (see below), whose sum is σ = 31855434. Its totient is φ = 10618476.

The previous prime is 21236951. The next prime is 21236983. The reversal of 21236954 is 45963212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 15784729 + 5452225 = 3973^2 + 2335^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21236954.

It is not an unprimeable number, because it can be changed into a prime (21236951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5309237 + ... + 5309240.

Almost surely, 2^21236954 is an apocalyptic number.

21236954 is a deficient number, since it is larger than the sum of its proper divisors (10618480).

21236954 is a wasteful number, since it uses less digits than its factorization.

21236954 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10618479.

The product of its digits is 12960, while the sum is 32.

The square root of 21236954 is about 4608.3569740201. The cubic root of 21236954 is about 276.9262185818.

The spelling of 21236954 in words is "twenty-one million, two hundred thirty-six thousand, nine hundred fifty-four".