21344654 has 4 divisors (see below), whose sum is σ = 32016984. Its totient is φ = 10672326.

The previous prime is 21344629. The next prime is 21344663. The reversal of 21344654 is 45644312.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5336162 + ... + 5336165.

It is an arithmetic number, because the mean of its divisors is an integer number (8004246).

Almost surely, 2^21344654 is an apocalyptic number.

21344654 is a deficient number, since it is larger than the sum of its proper divisors (10672330).

21344654 is a wasteful number, since it uses less digits than its factorization.

21344654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10672329.

The product of its digits is 11520, while the sum is 29.

The square root of 21344654 is about 4620.0274890957. The cubic root of 21344654 is about 277.3935592643.

Adding to 21344654 its reverse (45644312), we get a palindrome (66988966).

The spelling of 21344654 in words is "twenty-one million, three hundred forty-four thousand, six hundred fifty-four".