21471632481 has 16 divisors (see below), whose sum is σ = 30876640704. Its totient is φ = 13193778624.

The previous prime is 21471632471. The next prime is 21471632531. The reversal of 21471632481 is 18423617412.

It is not a de Polignac number, because 21471632481 - 2⁹ = 21471631969 is a prime.

It is a super-2 number, since 2×21471632481² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (21471632411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 380211 + ... + 433016.

It is an arithmetic number, because the mean of its divisors is an integer number (1929790044).

Almost surely, 2^21471632481 is an apocalyptic number.

It is an amenable number.

21471632481 is a deficient number, since it is larger than the sum of its proper divisors (9405008223).

21471632481 is a wasteful number, since it uses less digits than its factorization.

21471632481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 813920.

The product of its digits is 64512, while the sum is 39.

The spelling of 21471632481 in words is "twenty-one billion, four hundred seventy-one million, six hundred thirty-two thousand, four hundred eighty-one".