21613045 has 8 divisors (see below), whose sum is σ = 26772480. Its totient is φ = 16732560.

The previous prime is 21613043. The next prime is 21613049. The reversal of 21613045 is 54031612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21613045 - 2¹ = 21613043 is a prime.

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21613043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69565 + ... + 69874.

It is an arithmetic number, because the mean of its divisors is an integer number (3346560).

Almost surely, 2^21613045 is an apocalyptic number.

It is an amenable number.

21613045 is a deficient number, since it is larger than the sum of its proper divisors (5159435).

21613045 is a wasteful number, since it uses less digits than its factorization.

21613045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139475.

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

The square root of 21613045 is about 4648.9832221680. The cubic root of 21613045 is about 278.5513831104.

Adding to 21613045 its reverse (54031612), we get a palindrome (75644657).

The spelling of 21613045 in words is "twenty-one million, six hundred thirteen thousand, forty-five".