21417270 has 32 divisors (see below), whose sum is σ = 58745088. Its totient is φ = 4895328.

The previous prime is 21417269. The next prime is 21417271. The reversal of 21417270 is 7271412.

It is an interprime number because it is at equal distance from previous prime (21417269) and next prime (21417271).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21417270.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21417271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50784 + ... + 51203.

It is an arithmetic number, because the mean of its divisors is an integer number (1835784).

Almost surely, 2^21417270 is an apocalyptic number.

21417270 is an abundant number, since it is smaller than the sum of its proper divisors (37327818).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21417270 is a wasteful number, since it uses less digits than its factorization.

21417270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102004.

The product of its (nonzero) digits is 784, while the sum is 24.

The square root of 21417270 is about 4627.8796440703. The cubic root of 21417270 is about 277.7077739447.

Adding to 21417270 its reverse (7271412), we get a palindrome (28688682).

The spelling of 21417270 in words is "twenty-one million, four hundred seventeen thousand, two hundred seventy".