21770542466 has 4 divisors (see below), whose sum is σ = 32655813702. Its totient is φ = 10885271232.

The previous prime is 21770542463. The next prime is 21770542471. The reversal of 21770542466 is 66424507712.

It is a happy number.

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., 13116891841 + 8653650625 = 114529^2 + 93025^2 .

It is a super-2 number, since 2×21770542466² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21770542463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5442635615 + ... + 5442635618.

Almost surely, 2^21770542466 is an apocalyptic number.

21770542466 is a deficient number, since it is larger than the sum of its proper divisors (10885271236).

21770542466 is a wasteful number, since it uses less digits than its factorization.

21770542466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10885271235.

The product of its (nonzero) digits is 564480, while the sum is 44.

The spelling of 21770542466 in words is "twenty-one billion, seven hundred seventy million, five hundred forty-two thousand, four hundred sixty-six".