21068354 has 4 divisors (see below), whose sum is σ = 31602534. Its totient is φ = 10534176.

The previous prime is 21068339. The next prime is 21068357. The reversal of 21068354 is 45386012.

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., 20912329 + 156025 = 4573^2 + 395^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21068357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5267087 + ... + 5267090.

Almost surely, 2^21068354 is an apocalyptic number.

21068354 is a deficient number, since it is larger than the sum of its proper divisors (10534180).

21068354 is a wasteful number, since it uses less digits than its factorization.

21068354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10534179.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 21068354 is about 4590.0276687619. The cubic root of 21068354 is about 276.1914323401.

The spelling of 21068354 in words is "twenty-one million, sixty-eight thousand, three hundred fifty-four".