203111220211021 has 8 divisors (see below), whose sum is σ = 204328061965440. Its totient is φ = 201894385681968.

The previous prime is 203111220210979. The next prime is 203111220211037. The reversal of 203111220211021 is 120112022111302.

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 203111220211021 - 2¹¹ = 203111220208973 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 203111220211021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203111220211721) 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, 61133040 + ... + 64369798.

It is an arithmetic number, because the mean of its divisors is an integer number (25541007745680).

Almost surely, 2^{203111220211021} is an apocalyptic number.

It is an amenable number.

203111220211021 is a deficient number, since it is larger than the sum of its proper divisors (1216841754419).

203111220211021 is a wasteful number, since it uses less digits than its factorization.

203111220211021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3612683.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 203111220211021 its reverse (120112022111302), we get a palindrome (323223242322323).

The spelling of 203111220211021 in words is "two hundred three trillion, one hundred eleven billion, two hundred twenty million, two hundred eleven thousand, twenty-one".