20120221011001 has 12 divisors (see below), whose sum is σ = 21240000059412. Its totient is φ = 19056697196544.

The previous prime is 20120221010999. The next prime is 20120221011029. The reversal of 20120221011001 is 10011012202102.

It can be written as a sum of positive squares in 2 ways, for example, as 14407528275625 + 5712692735376 = 3795725^2 + 2390124^2 .

It is not a de Polignac number, because 20120221011001 - 2¹ = 20120221010999 is a prime.

It is a super-2 number, since 2×20120221011001² (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 (20120221011031) 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, 5163720 + ... + 8179513.

It is an arithmetic number, because the mean of its divisors is an integer number (1770000004951).

Almost surely, 2^{20120221011001} is an apocalyptic number.

It is an amenable number.

20120221011001 is a deficient number, since it is larger than the sum of its proper divisors (1119779048411).

20120221011001 is a wasteful number, since it uses less digits than its factorization.

20120221011001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13347448 (or 13347429 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20120221011001 its reverse (10011012202102), we get a palindrome (30131233213103).

The spelling of 20120221011001 in words is "twenty trillion, one hundred twenty billion, two hundred twenty-one million, eleven thousand, one".