21050267 has 16 divisors (see below), whose sum is σ = 26583552. Its totient is φ = 16241280.

The previous prime is 21050251. The next prime is 21050269. The reversal of 21050267 is 76205012.

It is a cyclic number.

It is not a de Polignac number, because 21050267 - 2⁴ = 21050251 is a prime.

It is a super-2 number, since 2×21050267² = 886227481542578, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21050269) 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, 1109 + ... + 6582.

It is an arithmetic number, because the mean of its divisors is an integer number (1661472).

Almost surely, 2^21050267 is an apocalyptic number.

21050267 is a deficient number, since it is larger than the sum of its proper divisors (5533285).

21050267 is a wasteful number, since it uses less digits than its factorization.

21050267 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7738.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 21050267 is about 4588.0569961586. The cubic root of 21050267 is about 276.1123737254.

Adding to 21050267 its reverse (76205012), we get a palindrome (97255279).

The spelling of 21050267 in words is "twenty-one million, fifty thousand, two hundred sixty-seven".