21465902 has 4 divisors (see below), whose sum is σ = 32198856. Its totient is φ = 10732950.

The previous prime is 21465881. The next prime is 21465907. The reversal of 21465902 is 20956412.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21465907) 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 as a sum of consecutive naturals, namely, 5366474 + ... + 5366477.

It is an arithmetic number, because the mean of its divisors is an integer number (8049714).

Almost surely, 2^21465902 is an apocalyptic number.

21465902 is a deficient number, since it is larger than the sum of its proper divisors (10732954).

21465902 is a wasteful number, since it uses less digits than its factorization.

21465902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10732953.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 21465902 is about 4633.1309068491. The cubic root of 21465902 is about 277.9178112196.

The spelling of 21465902 in words is "twenty-one million, four hundred sixty-five thousand, nine hundred two".