21012267 has 8 divisors (see below), whose sum is σ = 28039120. Its totient is φ = 13996800.

The previous prime is 21012259. The next prime is 21012281. The reversal of 21012267 is 76221012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21012267 - 2³ = 21012259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21012227) 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, 3459 + ... + 7347.

It is an arithmetic number, because the mean of its divisors is an integer number (3504890).

Almost surely, 2^21012267 is an apocalyptic number.

21012267 is a deficient number, since it is larger than the sum of its proper divisors (7026853).

21012267 is a wasteful number, since it uses less digits than its factorization.

21012267 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5693.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 21012267 is about 4583.9139389827. The cubic root of 21012267 is about 275.9461273765.

Adding to 21012267 its reverse (76221012), we get a palindrome (97233279).

The spelling of 21012267 in words is "twenty-one million, twelve thousand, two hundred sixty-seven".