21263350 has 24 divisors (see below), whose sum is σ = 39807720. Its totient is φ = 8449920.

The previous prime is 21263309. The next prime is 21263353. The reversal of 21263350 is 5336212.

It is a zygodrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21263353) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6846 + ... + 9454.

It is an arithmetic number, because the mean of its divisors is an integer number (1658655).

Almost surely, 2^21263350 is an apocalyptic number.

21263350 is a deficient number, since it is larger than the sum of its proper divisors (18544370).

21263350 is a wasteful number, since it uses less digits than its factorization.

21263350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2784 (or 2779 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 21263350 is about 4611.2200121009. The cubic root of 21263350 is about 277.0409041759.

Adding to 21263350 its reverse (5336212), we get a palindrome (26599562).

It can be divided in two parts, 2126 and 3350, that added together give a square (5476 = 74²).

The spelling of 21263350 in words is "twenty-one million, two hundred sixty-three thousand, three hundred fifty".