21263150 has 24 divisors (see below), whose sum is σ = 39766800. Its totient is φ = 8458560.

The previous prime is 21263149. The next prime is 21263153. The reversal of 21263150 is 5136212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21263153) 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, 8882 + ... + 11018.

It is an arithmetic number, because the mean of its divisors is an integer number (1656950).

Almost surely, 2^21263150 is an apocalyptic number.

21263150 is a deficient number, since it is larger than the sum of its proper divisors (18503650).

21263150 is a wasteful number, since it uses less digits than its factorization.

21263150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2348 (or 2343 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 21263150 is about 4611.1983258151. The cubic root of 21263150 is about 277.0400355709.

Adding to 21263150 its reverse (5136212), we get a palindrome (26399362).

It can be divided in two parts, 21 and 263150, that multiplied together give a triangular number (5526150 = T₃₃₂₄).

The spelling of 21263150 in words is "twenty-one million, two hundred sixty-three thousand, one hundred fifty".