21082902 has 16 divisors (see below), whose sum is σ = 42436272. Its totient is φ = 6982560.

The previous prime is 21082879. The next prime is 21082903. The reversal of 21082902 is 20928012.

It is a super-3 number, since 3×21082902³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21082903) by changing a digit.

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, 10249 + ... + 12132.

It is an arithmetic number, because the mean of its divisors is an integer number (2652267).

Almost surely, 2^21082902 is an apocalyptic number.

21082902 is an abundant number, since it is smaller than the sum of its proper divisors (21353370).

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

21082902 is a wasteful number, since it uses less digits than its factorization.

21082902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22543.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 21082902 is about 4591.6121351874. The cubic root of 21082902 is about 276.2549890925.

The spelling of 21082902 in words is "twenty-one million, eighty-two thousand, nine hundred two".