21471670 has 16 divisors (see below), whose sum is σ = 42162768. Its totient is φ = 7807840.

The previous prime is 21471661. The next prime is 21471677. The reversal of 21471670 is 7617412.

It is a super-2 number, since 2×21471670² = 922065225177800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21471677) 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 7 ways as a sum of consecutive naturals, for example, 97489 + ... + 97708.

It is an arithmetic number, because the mean of its divisors is an integer number (2635173).

Almost surely, 2^21471670 is an apocalyptic number.

21471670 is a deficient number, since it is larger than the sum of its proper divisors (20691098).

21471670 is a wasteful number, since it uses less digits than its factorization.

21471670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195215.

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 21471670 is about 4633.7533382777. The cubic root of 21471670 is about 277.9427016462.

The spelling of 21471670 in words is "twenty-one million, four hundred seventy-one thousand, six hundred seventy".