21653221162454 has 16 divisors (see below), whose sum is σ = 37226168196000. Its totient is φ = 9253361804544.

The previous prime is 21653221162399. The next prime is 21653221162493. The reversal of 21653221162454 is 45426112235612.

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 7 ways as a sum of consecutive naturals, for example, 2215838459 + ... + 2215848230.

It is an arithmetic number, because the mean of its divisors is an integer number (2326635512250).

Almost surely, 2^{21653221162454} is an apocalyptic number.

21653221162454 is a deficient number, since it is larger than the sum of its proper divisors (15572947033546).

21653221162454 is a wasteful number, since it uses less digits than its factorization.

21653221162454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4431687047.

The product of its digits is 691200, while the sum is 44.

The spelling of 21653221162454 in words is "twenty-one trillion, six hundred fifty-three billion, two hundred twenty-one million, one hundred sixty-two thousand, four hundred fifty-four".