21051467 has 8 divisors (see below), whose sum is σ = 21865536. Its totient is φ = 20252232.

The previous prime is 21051461. The next prime is 21051473. The reversal of 21051467 is 76415012.

It is an interprime number because it is at equal distance from previous prime (21051461) and next prime (21051473).

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

It is a cyclic number.

It is not a de Polignac number, because 21051467 - 2⁴ = 21051451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21051461) 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, 773 + ... + 6534.

It is an arithmetic number, because the mean of its divisors is an integer number (2733192).

Almost surely, 2^21051467 is an apocalyptic number.

21051467 is a deficient number, since it is larger than the sum of its proper divisors (814069).

21051467 is an equidigital number, since it uses as much as digits as its factorization.

21051467 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7417.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 21051467 is about 4588.1877686076. The cubic root of 21051467 is about 276.1176203501.

Adding to 21051467 its reverse (76415012), we get a palindrome (97466479).

The spelling of 21051467 in words is "twenty-one million, fifty-one thousand, four hundred sixty-seven".