21445902 has 12 divisors (see below), whose sum is σ = 46466160. Its totient is φ = 7148628.

The previous prime is 21445873. The next prime is 21445909. The reversal of 21445902 is 20954412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21445909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 595702 + ... + 595737.

It is an arithmetic number, because the mean of its divisors is an integer number (3872180).

Almost surely, 2^21445902 is an apocalyptic number.

21445902 is an abundant number, since it is smaller than the sum of its proper divisors (25020258).

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

21445902 is a wasteful number, since it uses less digits than its factorization.

21445902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1191447 (or 1191444 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 21445902 is about 4630.9720361928. The cubic root of 21445902 is about 277.8314714457.

The spelling of 21445902 in words is "twenty-one million, four hundred forty-five thousand, nine hundred two".