21014867 has 2 divisors, whose sum is σ = 21014868. Its totient is φ = 21014866.

The previous prime is 21014863. The next prime is 21014887. The reversal of 21014867 is 76841012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21014867 - 2² = 21014863 is a prime.

It is not a weakly prime, because it can be changed into another prime (21014863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10507433 + 10507434.

It is an arithmetic number, because the mean of its divisors is an integer number (10507434).

Almost surely, 2^21014867 is an apocalyptic number.

21014867 is a deficient number, since it is larger than the sum of its proper divisors (1).

21014867 is an equidigital number, since it uses as much as digits as its factorization.

21014867 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 21014867 is about 4584.1975306481. The cubic root of 21014867 is about 275.9575085114.

Adding to 21014867 its reverse (76841012), we get a palindrome (97855879).

The spelling of 21014867 in words is "twenty-one million, fourteen thousand, eight hundred sixty-seven".