21859038 has 32 divisors (see below), whose sum is σ = 48729600. Its totient is φ = 7263288.

The previous prime is 21859037. The next prime is 21859043. The reversal of 21859038 is 83095812.

It is a super-3 number, since 3×21859038³ (a number of 23 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 21858993 and 21859011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21859031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30043 + ... + 30761.

It is an arithmetic number, because the mean of its divisors is an integer number (1522800).

Almost surely, 2^21859038 is an apocalyptic number.

21859038 is an abundant number, since it is smaller than the sum of its proper divisors (26870562).

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

21859038 is a wasteful number, since it uses less digits than its factorization.

21859038 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1293 (or 1287 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 21859038 is about 4675.3650124883. The cubic root of 21859038 is about 279.6041941569.

The spelling of 21859038 in words is "twenty-one million, eight hundred fifty-nine thousand, thirty-eight".