21895206754 has 4 divisors (see below), whose sum is σ = 32842810134. Its totient is φ = 10947603376.

The previous prime is 21895206727. The next prime is 21895206787. The reversal of 21895206754 is 45760259812.

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

It can be written as a sum of positive squares in only one way, i.e., 19888614729 + 2006592025 = 141027^2 + 44795^2 .

It is a Smith number, since the sum of its digits (49) 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 = 21895206698 and 21895206707.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5473801687 + ... + 5473801690.

Almost surely, 2^21895206754 is an apocalyptic number.

21895206754 is a deficient number, since it is larger than the sum of its proper divisors (10947603380).

21895206754 is a wasteful number, since it uses less digits than its factorization.

21895206754 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10947603379.

The product of its (nonzero) digits is 1209600, while the sum is 49.

The spelling of 21895206754 in words is "twenty-one billion, eight hundred ninety-five million, two hundred six thousand, seven hundred fifty-four".