21471653 has 12 divisors (see below), whose sum is σ = 26292960. Its totient is φ = 17434872.

The previous prime is 21471641. The next prime is 21471661. The reversal of 21471653 is 35617412.

It is not a de Polignac number, because 21471653 - 2⁶ = 21471589 is a prime.

It is a super-2 number, since 2×21471653² = 922063765104818, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21471953) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10601 + ... + 12462.

It is an arithmetic number, because the mean of its divisors is an integer number (2191080).

Almost surely, 2^21471653 is an apocalyptic number.

It is an amenable number.

21471653 is a deficient number, since it is larger than the sum of its proper divisors (4821307).

21471653 is a wasteful number, since it uses less digits than its factorization.

21471653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23096 (or 23089 counting only the distinct ones).

The product of its digits is 5040, while the sum is 29.

The square root of 21471653 is about 4633.7515039113. The cubic root of 21471653 is about 277.9426282933.

The spelling of 21471653 in words is "twenty-one million, four hundred seventy-one thousand, six hundred fifty-three".