2123991903 has 8 divisors (see below), whose sum is σ = 3089442816. Its totient is φ = 1287267800.

The previous prime is 2123991901. The next prime is 2123991911. The reversal of 2123991903 is 3091993212.

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 2123991903 - 2¹ = 2123991901 is a prime.

It is a super-2 number, since 2×2123991903² = 9022683208019122818, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2123991901) 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, 32181663 + ... + 32181728.

It is an arithmetic number, because the mean of its divisors is an integer number (386180352).

Almost surely, 2^2123991903 is an apocalyptic number.

2123991903 is a deficient number, since it is larger than the sum of its proper divisors (965450913).

2123991903 is a wasteful number, since it uses less digits than its factorization.

2123991903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64363405.

The product of its (nonzero) digits is 26244, while the sum is 39.

The square root of 2123991903 is about 46086.7866421602. The cubic root of 2123991903 is about 1285.4374611125.

The spelling of 2123991903 in words is "two billion, one hundred twenty-three million, nine hundred ninety-one thousand, nine hundred three".