21162045 has 8 divisors (see below), whose sum is σ = 33859296. Its totient is φ = 11286416.

The previous prime is 21162041. The next prime is 21162107. The reversal of 21162045 is 54026112.

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

It is a cyclic number.

It is not a de Polignac number, because 21162045 - 2² = 21162041 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21162041) 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, 705387 + ... + 705416.

It is an arithmetic number, because the mean of its divisors is an integer number (4232412).

Almost surely, 2^21162045 is an apocalyptic number.

It is an amenable number.

21162045 is a deficient number, since it is larger than the sum of its proper divisors (12697251).

21162045 is a wasteful number, since it uses less digits than its factorization.

21162045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1410811.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 21162045 is about 4600.2222772384. Note that the first 4 decimals coincide. The cubic root of 21162045 is about 276.6002348524.

Adding to 21162045 its reverse (54026112), we get a palindrome (75188157).

The spelling of 21162045 in words is "twenty-one million, one hundred sixty-two thousand, forty-five".