21139002 has 32 divisors (see below), whose sum is σ = 47980800. Its totient is φ = 6895584.

The previous prime is 21138989. The next prime is 21139009. The reversal of 21139002 is 20093112.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21139009) 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 15 ways as a sum of consecutive naturals, for example, 1627 + ... + 6702.

It is an arithmetic number, because the mean of its divisors is an integer number (1499400).

Almost surely, 2^21139002 is an apocalyptic number.

21139002 is an abundant number, since it is smaller than the sum of its proper divisors (26841798).

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

21139002 is a wasteful number, since it uses less digits than its factorization.

21139002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8387 (or 8381 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 21139002 is about 4597.7170421852. The cubic root of 21139002 is about 276.4998032540.

The spelling of 21139002 in words is "twenty-one million, one hundred thirty-nine thousand, two".