21471023 has 8 divisors (see below), whose sum is σ = 24686592. Its totient is φ = 18292536.

The previous prime is 21471019. The next prime is 21471041. The reversal of 21471023 is 32017412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21471023 - 2² = 21471019 is a prime.

It is a super-2 number, since 2×21471023² = 922009657333058, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21470986 and 21471004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21471523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8015 + ... + 10352.

It is an arithmetic number, because the mean of its divisors is an integer number (3085824).

Almost surely, 2^21471023 is an apocalyptic number.

21471023 is a deficient number, since it is larger than the sum of its proper divisors (3215569).

21471023 is a wasteful number, since it uses less digits than its factorization.

21471023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18541.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 21471023 is about 4633.6835239364. The cubic root of 21471023 is about 277.9399098942.

Adding to 21471023 its reverse (32017412), we get a palindrome (53488435).

The spelling of 21471023 in words is "twenty-one million, four hundred seventy-one thousand, twenty-three".