21480783194 has 48 divisors (see below), whose sum is σ = 36996429240. Its totient is φ = 9317468160.

The previous prime is 21480783193. The next prime is 21480783217. The reversal of 21480783194 is 49138708412.

It can be written as a sum of positive squares in 12 ways, for example, as 1893381169 + 19587402025 = 43513^2 + 139955^2 .

It is a super-2 number, since 2×21480783194² (a number of 21 digits) contains 22 as substring.

It is a zygodrome in base 4.

It is not an unprimeable number, because it can be changed into a prime (21480783193) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4646204 + ... + 4650824.

Almost surely, 2^21480783194 is an apocalyptic number.

21480783194 is a deficient number, since it is larger than the sum of its proper divisors (15515646046).

21480783194 is a wasteful number, since it uses less digits than its factorization.

21480783194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5475 (or 5462 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 47.

The spelling of 21480783194 in words is "twenty-one billion, four hundred eighty million, seven hundred eighty-three thousand, one hundred ninety-four".