21389102 has 8 divisors (see below), whose sum is σ = 36667056. Its totient is φ = 9166752.

The previous prime is 21389087. The next prime is 21389107. The reversal of 21389102 is 20198312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21389107) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 763883 + ... + 763910.

It is an arithmetic number, because the mean of its divisors is an integer number (4583382).

Almost surely, 2^21389102 is an apocalyptic number.

21389102 is a deficient number, since it is larger than the sum of its proper divisors (15277954).

21389102 is a wasteful number, since it uses less digits than its factorization.

21389102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1527802.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 21389102 is about 4624.8353484205. The cubic root of 21389102 is about 277.5859734156.

The spelling of 21389102 in words is "twenty-one million, three hundred eighty-nine thousand, one hundred two".