20130552221 has 8 divisors (see below), whose sum is σ = 21692452824. Its totient is φ = 18570565440.

The previous prime is 20130552209. The next prime is 20130552251. The reversal of 20130552221 is 12225503102.

It can be written as a sum of positive squares in 4 ways, for example, as 421480900 + 19709071321 = 20530^2 + 140389^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20130552221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20130552251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 456566 + ... + 498711.

It is an arithmetic number, because the mean of its divisors is an integer number (2711556603).

Almost surely, 2^20130552221 is an apocalyptic number.

It is an amenable number.

20130552221 is a deficient number, since it is larger than the sum of its proper divisors (1561900603).

20130552221 is a wasteful number, since it uses less digits than its factorization.

20130552221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 956911.

The product of its (nonzero) digits is 1200, while the sum is 23.

The spelling of 20130552221 in words is "twenty billion, one hundred thirty million, five hundred fifty-two thousand, two hundred twenty-one".