21219471 has 36 divisors (see below), whose sum is σ = 37949808. Its totient is φ = 11187072.

The previous prime is 21219449. The next prime is 21219481. The reversal of 21219471 is 17491212.

It is not a de Polignac number, because 21219471 - 2⁵ = 21219439 is a prime.

It is a super-3 number, since 3×21219471³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21219431) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 9651 + ... + 11643.

Almost surely, 2^21219471 is an apocalyptic number.

21219471 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21219471 is a deficient number, since it is larger than the sum of its proper divisors (16730337).

21219471 is a wasteful number, since it uses less digits than its factorization.

21219471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2032 (or 2016 counting only the distinct ones).

The product of its digits is 1008, while the sum is 27.

The square root of 21219471 is about 4606.4597035033. The cubic root of 21219471 is about 276.8502059507.

It can be divided in two parts, 212 and 19471, that added together give a 9-th power (19683 = 3⁹).

The spelling of 21219471 in words is "twenty-one million, two hundred nineteen thousand, four hundred seventy-one".