21450146 has 4 divisors (see below), whose sum is σ = 32175222. Its totient is φ = 10725072.

The previous prime is 21450137. The next prime is 21450161. The reversal of 21450146 is 64105412.

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., 11458225 + 9991921 = 3385^2 + 3161^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5362535 + ... + 5362538.

Almost surely, 2^21450146 is an apocalyptic number.

21450146 is a deficient number, since it is larger than the sum of its proper divisors (10725076).

21450146 is a wasteful number, since it uses less digits than its factorization.

21450146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10725075.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 21450146 is about 4631.4302326603. The cubic root of 21450146 is about 277.8497972311.

Adding to 21450146 its reverse (64105412), we get a palindrome (85555558).

The spelling of 21450146 in words is "twenty-one million, four hundred fifty thousand, one hundred forty-six".