21149068944 has 20 divisors (see below), whose sum is σ = 54635094896. Its totient is φ = 7049689632.

The previous prime is 21149068937. The next prime is 21149068949. The reversal of 21149068944 is 44986094112.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 440605603 = 21149068944 / (2 + 1 + 1 + 4 + 9 + 0 + 6 + 8 + 9 + 4 + 4).

It is a junction number, because it is equal to n+sod(n) for n = 21149068893 and 21149068902.

It is not an unprimeable number, because it can be changed into a prime (21149068949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 220302754 + ... + 220302849.

Almost surely, 2^21149068944 is an apocalyptic number.

21149068944 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21149068944 is an abundant number, since it is smaller than the sum of its proper divisors (33486025952).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21149068944 is a wasteful number, since it uses less digits than its factorization.

21149068944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440605614 (or 440605608 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 48.

The spelling of 21149068944 in words is "twenty-one billion, one hundred forty-nine million, sixty-eight thousand, nine hundred forty-four".