1721120553 has 12 divisors (see below), whose sum is σ = 2498558400. Its totient is φ = 1141646616.

The previous prime is 1721120543. The next prime is 1721120587. The reversal of 1721120553 is 3550211271.

It is not a de Polignac number, because 1721120553 - 2⁹ = 1721120041 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1721120503) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 478701 + ... + 482282.

It is an arithmetic number, because the mean of its divisors is an integer number (208213200).

Almost surely, 2^1721120553 is an apocalyptic number.

It is an amenable number.

1721120553 is a deficient number, since it is larger than the sum of its proper divisors (777437847).

1721120553 is a wasteful number, since it uses less digits than its factorization.

1721120553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 961188 (or 961185 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 27.

The square root of 1721120553 is about 41486.3899730984. The cubic root of 1721120553 is about 1198.4054174439.

The spelling of 1721120553 in words is "one billion, seven hundred twenty-one million, one hundred twenty thousand, five hundred fifty-three".