21266030 has 16 divisors (see below), whose sum is σ = 39943584. Its totient is φ = 8136480.

The previous prime is 21266029. The next prime is 21266033. The reversal of 21266030 is 3066212.

It is a junction number, because it is equal to n+sod(n) for n = 21265993 and 21266011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21266033) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46001 + ... + 46460.

It is an arithmetic number, because the mean of its divisors is an integer number (2496474).

Almost surely, 2^21266030 is an apocalyptic number.

21266030 is a deficient number, since it is larger than the sum of its proper divisors (18677554).

21266030 is a wasteful number, since it uses less digits than its factorization.

21266030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92491.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 21266030 is about 4611.5105984916. The cubic root of 21266030 is about 277.0525429571.

The spelling of 21266030 in words is "twenty-one million, two hundred sixty-six thousand, thirty".