21742887754 has 32 divisors (see below), whose sum is σ = 37676612736. Its totient is φ = 9217704960.

The previous prime is 21742887743. The next prime is 21742887791. The reversal of 21742887754 is 45778824712.

It is a Smith number, since the sum of its digits (55) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 21742887695 and 21742887704.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5336262 + ... + 5340334.

It is an arithmetic number, because the mean of its divisors is an integer number (1177394148).

Almost surely, 2^21742887754 is an apocalyptic number.

21742887754 is a deficient number, since it is larger than the sum of its proper divisors (15933724982).

21742887754 is a wasteful number, since it uses less digits than its factorization.

21742887754 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8110.

The product of its digits is 7024640, while the sum is 55.

The spelling of 21742887754 in words is "twenty-one billion, seven hundred forty-two million, eight hundred eighty-seven thousand, seven hundred fifty-four".