21454554431412 has 144 divisors (see below), whose sum is σ = 54503201712960. Its totient is φ = 7115928551424.

The previous prime is 21454554431389. The next prime is 21454554431447. The reversal of 21454554431412 is 21413445545412.

21454554431412 is a `hidden beast` number, since 2 + 1 + 4 + 54 + 554 + 4 + 3 + 1 + 41 + 2 = 666.

It is a super-2 number, since 2×21454554431412² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11099095998 + ... + 11099097930.

It is an arithmetic number, because the mean of its divisors is an integer number (378494456340).

Almost surely, 2^{21454554431412} is an apocalyptic number.

It is an amenable number.

21454554431412 is an abundant number, since it is smaller than the sum of its proper divisors (33048647281548).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21454554431412 is a wasteful number, since it uses less digits than its factorization.

21454554431412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3982 (or 3977 counting only the distinct ones).

The product of its digits is 1536000, while the sum is 45.

Adding to 21454554431412 its reverse (21413445545412), we get a palindrome (42867999976824).

The spelling of 21454554431412 in words is "twenty-one trillion, four hundred fifty-four billion, five hundred fifty-four million, four hundred thirty-one thousand, four hundred twelve".