21142450 has 48 divisors (see below), whose sum is σ = 46514880. Its totient is φ = 6995520.

The previous prime is 21142447. The next prime is 21142463. The reversal of 21142450 is 5424112.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9109 + ... + 11191.

It is an arithmetic number, because the mean of its divisors is an integer number (969060).

Almost surely, 2^21142450 is an apocalyptic number.

21142450 is an abundant number, since it is smaller than the sum of its proper divisors (25372430).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21142450 is a wasteful number, since it uses less digits than its factorization.

21142450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2131 (or 2126 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 21142450 is about 4598.0919955999. The cubic root of 21142450 is about 276.5148358068.

Adding to 21142450 its reverse (5424112), we get a palindrome (26566562).

The spelling of 21142450 in words is "twenty-one million, one hundred forty-two thousand, four hundred fifty".