21401170 has 32 divisors (see below), whose sum is σ = 45220608. Its totient is φ = 7138368.

The previous prime is 21401137. The next prime is 21401203. The reversal of 21401170 is 7110412.

It is an interprime number because it is at equal distance from previous prime (21401137) and next prime (21401203).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1542 + ... + 6721.

It is an arithmetic number, because the mean of its divisors is an integer number (1413144).

Almost surely, 2^21401170 is an apocalyptic number.

21401170 is an abundant number, since it is smaller than the sum of its proper divisors (23819438).

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

21401170 is a wasteful number, since it uses less digits than its factorization.

21401170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8314.

The product of its (nonzero) digits is 56, while the sum is 16.

The square root of 21401170 is about 4626.1398595373. The cubic root of 21401170 is about 277.6381694312.

Adding to 21401170 its reverse (7110412), we get a palindrome (28511582).

The spelling of 21401170 in words is "twenty-one million, four hundred one thousand, one hundred seventy".