21487488478412 has 12 divisors (see below), whose sum is σ = 41021568913416. Its totient is φ = 9767040217440.

The previous prime is 21487488478411. The next prime is 21487488478453.

21487488478412 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×21487488478412² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21487488478411) 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, 244176005393 + ... + 244176005480.

It is an arithmetic number, because the mean of its divisors is an integer number (3418464076118).

Almost surely, 2^{21487488478412} is an apocalyptic number.

21487488478412 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21487488478412 is a deficient number, since it is larger than the sum of its proper divisors (19534080435004).

21487488478412 is a wasteful number, since it uses less digits than its factorization.

21487488478412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488352010888 (or 488352010886 counting only the distinct ones).

The product of its digits is 205520896, while the sum is 68.

The spelling of 21487488478412 in words is "twenty-one trillion, four hundred eighty-seven billion, four hundred eighty-eight million, four hundred seventy-eight thousand, four hundred twelve".