21481703666158 has 4 divisors (see below), whose sum is σ = 32222555499240. Its totient is φ = 10740851833078.

The previous prime is 21481703666107. The next prime is 21481703666167. The reversal of 21481703666158 is 85166630718412.

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

It is a super-2 number, since 2×21481703666158² (a number of 27 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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, 5370425916538 + ... + 5370425916541.

It is an arithmetic number, because the mean of its divisors is an integer number (8055638874810).

Almost surely, 2^{21481703666158} is an apocalyptic number.

21481703666158 is a deficient number, since it is larger than the sum of its proper divisors (10740851833082).

21481703666158 is a wasteful number, since it uses less digits than its factorization.

21481703666158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10740851833081.

The product of its (nonzero) digits is 11612160, while the sum is 58.

The spelling of 21481703666158 in words is "twenty-one trillion, four hundred eighty-one billion, seven hundred three million, six hundred sixty-six thousand, one hundred fifty-eight".