13220724428 has 6 divisors (see below), whose sum is σ = 23136267756. Its totient is φ = 6610362212.

The previous prime is 13220724427. The next prime is 13220724437. The reversal of 13220724428 is 82442702231.

It is a super-2 number, since 2×13220724428² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13220724427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1652590550 + ... + 1652590557.

It is an arithmetic number, because the mean of its divisors is an integer number (3856044626).

Almost surely, 2^13220724428 is an apocalyptic number.

It is an amenable number.

13220724428 is a deficient number, since it is larger than the sum of its proper divisors (9915543328).

13220724428 is a wasteful number, since it uses less digits than its factorization.

13220724428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3305181111 (or 3305181109 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 35.

The spelling of 13220724428 in words is "thirteen billion, two hundred twenty million, seven hundred twenty-four thousand, four hundred twenty-eight".