21036494 has 4 divisors (see below), whose sum is σ = 31554744. Its totient is φ = 10518246.

The previous prime is 21036493. The next prime is 21036511. The reversal of 21036494 is 49463012.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21036493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5259122 + ... + 5259125.

It is an arithmetic number, because the mean of its divisors is an integer number (7888686).

Almost surely, 2^21036494 is an apocalyptic number.

21036494 is a deficient number, since it is larger than the sum of its proper divisors (10518250).

21036494 is a wasteful number, since it uses less digits than its factorization.

21036494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10518249.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 21036494 is about 4586.5557883885. Note that the first 3 decimals coincide. The cubic root of 21036494 is about 276.0521413077.

The spelling of 21036494 in words is "twenty-one million, thirty-six thousand, four hundred ninety-four".