21515445454214 has 4 divisors (see below), whose sum is σ = 32273168181324. Its totient is φ = 10757722727106.

The previous prime is 21515445454189. The next prime is 21515445454297. The reversal of 21515445454214 is 41245454451512.

It is a semiprime because it is the product of two primes.

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 as a sum of consecutive naturals, namely, 5378861363552 + ... + 5378861363555.

It is an arithmetic number, because the mean of its divisors is an integer number (8068292045331).

Almost surely, 2^{21515445454214} is an apocalyptic number.

21515445454214 is a deficient number, since it is larger than the sum of its proper divisors (10757722727110).

21515445454214 is a wasteful number, since it uses less digits than its factorization.

21515445454214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10757722727109.

The product of its digits is 2560000, while the sum is 47.

The spelling of 21515445454214 in words is "twenty-one trillion, five hundred fifteen billion, four hundred forty-five million, four hundred fifty-four thousand, two hundred fourteen".