21601354 has 4 divisors (see below), whose sum is σ = 32402034. Its totient is φ = 10800676.

The previous prime is 21601343. The next prime is 21601367. The reversal of 21601354 is 45310612.

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., 20839225 + 762129 = 4565^2 + 873^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5400337 + ... + 5400340.

Almost surely, 2^21601354 is an apocalyptic number.

21601354 is a deficient number, since it is larger than the sum of its proper divisors (10800680).

21601354 is a wasteful number, since it uses less digits than its factorization.

21601354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10800679.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 21601354 is about 4647.7256803731. The cubic root of 21601354 is about 278.5011490723.

Adding to 21601354 its reverse (45310612), we get a palindrome (66911966).

The spelling of 21601354 in words is "twenty-one million, six hundred one thousand, three hundred fifty-four".