21472028887 has 8 divisors (see below), whose sum is σ = 22343777280. Its totient is φ = 20617207800.

The previous prime is 21472028873. The next prime is 21472028899. The reversal of 21472028887 is 78882027412.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-21472028887 is a prime.

It is a super-2 number, since 2×21472028887² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21472028887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21472028087) 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, 4229239 + ... + 4234312.

It is an arithmetic number, because the mean of its divisors is an integer number (2792972160).

Almost surely, 2^21472028887 is an apocalyptic number.

21472028887 is a deficient number, since it is larger than the sum of its proper divisors (871748393).

21472028887 is an equidigital number, since it uses as much as digits as its factorization.

21472028887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8463653.

The product of its (nonzero) digits is 802816, while the sum is 49.

The spelling of 21472028887 in words is "twenty-one billion, four hundred seventy-two million, twenty-eight thousand, eight hundred eighty-seven".