203122220021 has 12 divisors (see below), whose sum is σ = 248721086880. Its totient is φ = 164941350840.

The previous prime is 203122220009. The next prime is 203122220027. The reversal of 203122220021 is 120022221302.

It is a de Polignac number, because none of the positive numbers 2^k-203122220021 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203122220027) 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, 109087265 + ... + 109089126.

It is an arithmetic number, because the mean of its divisors is an integer number (20726757240).

Almost surely, 2^203122220021 is an apocalyptic number.

It is an amenable number.

203122220021 is a deficient number, since it is larger than the sum of its proper divisors (45598866859).

203122220021 is a wasteful number, since it uses less digits than its factorization.

203122220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218176424 (or 218176417 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 203122220021 its reverse (120022221302), we get a palindrome (323144441323).

The spelling of 203122220021 in words is "two hundred three billion, one hundred twenty-two million, two hundred twenty thousand, twenty-one".