21349902 has 16 divisors (see below), whose sum is σ = 48799872. Its totient is φ = 6099960.

The previous prime is 21349877. The next prime is 21349907. The reversal of 21349902 is 20994312.

It is a self number, because there is not a number n which added to its sum of digits gives 21349902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21349907) 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, 254124 + ... + 254207.

It is an arithmetic number, because the mean of its divisors is an integer number (3049992).

Almost surely, 2^21349902 is an apocalyptic number.

21349902 is an abundant number, since it is smaller than the sum of its proper divisors (27449970).

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

21349902 is a wasteful number, since it uses less digits than its factorization.

21349902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 508343.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 21349902 is about 4620.5954161774. The cubic root of 21349902 is about 277.4162916091.

The spelling of 21349902 in words is "twenty-one million, three hundred forty-nine thousand, nine hundred two".