20120201021 has 8 divisors (see below), whose sum is σ = 20452389624. Its totient is φ = 19788088320.

The previous prime is 20120200973. The next prime is 20120201047. The reversal of 20120201021 is 12010202102.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6921408025 + 13198792996 = 83195^2 + 114886^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20120201021 - 2³⁰ = 19046459197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20120200993 and 20120201011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20120201071) 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, 814565 + ... + 838901.

It is an arithmetic number, because the mean of its divisors is an integer number (2556548703).

Almost surely, 2^20120201021 is an apocalyptic number.

It is an amenable number.

20120201021 is a deficient number, since it is larger than the sum of its proper divisors (332188603).

20120201021 is a wasteful number, since it uses less digits than its factorization.

20120201021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37951.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20120201021 its reverse (12010202102), we get a palindrome (32130403123).

The spelling of 20120201021 in words is "twenty billion, one hundred twenty million, two hundred one thousand, twenty-one".