21400467 has 32 divisors (see below), whose sum is σ = 33882624. Its totient is φ = 11865600.

The previous prime is 21400459. The next prime is 21400487. The reversal of 21400467 is 76400412.

It is not a de Polignac number, because 21400467 - 2³ = 21400459 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21400417) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20242 + ... + 21272.

It is an arithmetic number, because the mean of its divisors is an integer number (1058832).

Almost surely, 2^21400467 is an apocalyptic number.

21400467 is a deficient number, since it is larger than the sum of its proper divisors (12482157).

21400467 is a wasteful number, since it uses less digits than its factorization.

21400467 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1099.

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 21400467 is about 4626.0638776394. The cubic root of 21400467 is about 277.6351293829.

Adding to 21400467 its reverse (76400412), we get a palindrome (97800879).

Subtracting 21400467 from its reverse (76400412), we obtain a palindrome (54999945).

The spelling of 21400467 in words is "twenty-one million, four hundred thousand, four hundred sixty-seven".