21282241881 has 4 divisors (see below), whose sum is σ = 28376322512. Its totient is φ = 14188161252.

The previous prime is 21282241859. The next prime is 21282241891. The reversal of 21282241881 is 18814228212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21282241881 - 2¹¹ = 21282239833 is a prime.

It is a super-2 number, since 2×21282241881² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21282241801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3547040311 + ... + 3547040316.

It is an arithmetic number, because the mean of its divisors is an integer number (7094080628).

Almost surely, 2^21282241881 is an apocalyptic number.

It is an amenable number.

21282241881 is a deficient number, since it is larger than the sum of its proper divisors (7094080631).

21282241881 is an equidigital number, since it uses as much as digits as its factorization.

21282241881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7094080630.

The product of its digits is 32768, while the sum is 39.

The spelling of 21282241881 in words is "twenty-one billion, two hundred eighty-two million, two hundred forty-one thousand, eight hundred eighty-one".