203121213019 has 4 divisors (see below), whose sum is σ = 205132314240. Its totient is φ = 201110111800.

The previous prime is 203121213017. The next prime is 203121213077. The reversal of 203121213019 is 910312121302.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 910312121302 = 2 ⋅455156060651.

It is a cyclic number.

It is not a de Polignac number, because 203121213019 - 2¹ = 203121213017 is a prime.

It is a super-2 number, since 2×203121213019² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 203121212984 and 203121213002.

It is not an unprimeable number, because it can be changed into a prime (203121213017) 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, 1005550459 + ... + 1005550660.

It is an arithmetic number, because the mean of its divisors is an integer number (51283078560).

Almost surely, 2^203121213019 is an apocalyptic number.

203121213019 is a deficient number, since it is larger than the sum of its proper divisors (2011101221).

203121213019 is a wasteful number, since it uses less digits than its factorization.

203121213019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2011101220.

The product of its (nonzero) digits is 648, while the sum is 25.

The spelling of 203121213019 in words is "two hundred three billion, one hundred twenty-one million, two hundred thirteen thousand, nineteen".