203121220000001 has 4 divisors (see below), whose sum is σ = 208075396097604. Its totient is φ = 198167043902400.

The previous prime is 203121219999983. The next prime is 203121220000073. The reversal of 203121220000001 is 100000022121302.

It is a happy number.

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 120435370233025 + 82685849766976 = 10974305^2 + 9093176^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-203121220000001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (203121210000001) 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, 2477088048740 + ... + 2477088048821.

It is an arithmetic number, because the mean of its divisors is an integer number (52018849024401).

Almost surely, 2^{203121220000001} is an apocalyptic number.

It is an amenable number.

203121220000001 is a deficient number, since it is larger than the sum of its proper divisors (4954176097603).

203121220000001 is an equidigital number, since it uses as much as digits as its factorization.

203121220000001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4954176097602.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 203121220000001 its reverse (100000022121302), we get a palindrome (303121242121303).

The spelling of 203121220000001 in words is "two hundred three trillion, one hundred twenty-one billion, two hundred twenty million, one", and thus it is an aban number.