21299902 has 16 divisors (see below), whose sum is σ = 34508880. Its totient is φ = 9801792.

The previous prime is 21299897. The next prime is 21299923. The reversal of 21299902 is 20999212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9633 + ... + 11635.

It is an arithmetic number, because the mean of its divisors is an integer number (2156805).

Almost surely, 2^21299902 is an apocalyptic number.

21299902 is a deficient number, since it is larger than the sum of its proper divisors (13208978).

21299902 is a wasteful number, since it uses less digits than its factorization.

21299902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2427.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 21299902 is about 4615.1816865645. The cubic root of 21299902 is about 277.1995590475.

It can be divided in two parts, 21299 and 902, that added together give a square (22201 = 149²).

The spelling of 21299902 in words is "twenty-one million, two hundred ninety-nine thousand, nine hundred two".