21034054454 has 16 divisors (see below), whose sum is σ = 36146551200. Its totient is φ = 8992551744.

The previous prime is 21034054441. The next prime is 21034054501. The reversal of 21034054454 is 45445043012.

It is a self number, because there is not a number n which added to its sum of digits gives 21034054454.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1830989 + ... + 1842440.

It is an arithmetic number, because the mean of its divisors is an integer number (2259159450).

Almost surely, 2^21034054454 is an apocalyptic number.

21034054454 is a deficient number, since it is larger than the sum of its proper divisors (15112496746).

21034054454 is a wasteful number, since it uses less digits than its factorization.

21034054454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3673847.

The product of its (nonzero) digits is 38400, while the sum is 32.

Adding to 21034054454 its reverse (45445043012), we get a palindrome (66479097466).

The spelling of 21034054454 in words is "twenty-one billion, thirty-four million, fifty-four thousand, four hundred fifty-four".