20521133223 has 8 divisors (see below), whose sum is σ = 27362575728. Its totient is φ = 13680223104.

The previous prime is 20521133221. The next prime is 20521133231. The reversal of 20521133223 is 32233112502.

It is a happy number.

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

It is not a de Polignac number, because 20521133223 - 2¹ = 20521133221 is a prime.

It is a super-2 number, since 2×20521133223² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20521133193 and 20521133202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20521133221) 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, 32236 + ... + 205137.

It is an arithmetic number, because the mean of its divisors is an integer number (3420321966).

Almost surely, 2^20521133223 is an apocalyptic number.

20521133223 is a deficient number, since it is larger than the sum of its proper divisors (6841442505).

20521133223 is a wasteful number, since it uses less digits than its factorization.

20521133223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266193.

The product of its (nonzero) digits is 2160, while the sum is 24.

Adding to 20521133223 its reverse (32233112502), we get a palindrome (52754245725).

The spelling of 20521133223 in words is "twenty billion, five hundred twenty-one million, one hundred thirty-three thousand, two hundred twenty-three".