21073650 has 96 divisors (see below), whose sum is σ = 57371328. Its totient is φ = 5088000.

The previous prime is 21073643. The next prime is 21073673. The reversal of 21073650 is 5637012.

It is a hoax number, since the sum of its digits (24) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 21073650.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 196897 + ... + 197003.

It is an arithmetic number, because the mean of its divisors is an integer number (597618).

Almost surely, 2^21073650 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21073650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28685664).

21073650 is an abundant number, since it is smaller than the sum of its proper divisors (36297678).

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

21073650 is a wasteful number, since it uses less digits than its factorization.

21073650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236 (or 231 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 24.

The square root of 21073650 is about 4590.6045353526. The cubic root of 21073650 is about 276.2145726905.

The spelling of 21073650 in words is "twenty-one million, seventy-three thousand, six hundred fifty".