20011224131321 has 4 divisors (see below), whose sum is σ = 20012857312932. Its totient is φ = 20009590949712.

The previous prime is 20011224131287. The next prime is 20011224131359. The reversal of 20011224131321 is 12313142211002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6943035281296 + 13068188850025 = 2634964^2 + 3614995^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20011224131321 is a prime.

It is a super-2 number, since 2×20011224131321² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20011224101321) 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, 816572426 + ... + 816596931.

It is an arithmetic number, because the mean of its divisors is an integer number (5003214328233).

Almost surely, 2^{20011224131321} is an apocalyptic number.

It is an amenable number.

20011224131321 is a deficient number, since it is larger than the sum of its proper divisors (1633181611).

20011224131321 is a wasteful number, since it uses less digits than its factorization.

20011224131321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1633181610.

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 20011224131321 its reverse (12313142211002), we get a palindrome (32324366342323).

The spelling of 20011224131321 in words is "twenty trillion, eleven billion, two hundred twenty-four million, one hundred thirty-one thousand, three hundred twenty-one".