201213121421 has 32 divisors (see below), whose sum is σ = 227460441600. Its totient is φ = 176791380480.

The previous prime is 201213121397. The next prime is 201213121433. The reversal of 201213121421 is 124121312102.

It is not a de Polignac number, because 201213121421 - 2³⁰ = 200139379597 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201213121393 and 201213121402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201213121481) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3286790 + ... + 3347448.

It is an arithmetic number, because the mean of its divisors is an integer number (7108138800).

Almost surely, 2^201213121421 is an apocalyptic number.

It is an amenable number.

201213121421 is a deficient number, since it is larger than the sum of its proper divisors (26247320179).

201213121421 is a wasteful number, since it uses less digits than its factorization.

201213121421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60869.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 201213121421 its reverse (124121312102), we get a palindrome (325334433523).

The spelling of 201213121421 in words is "two hundred one billion, two hundred thirteen million, one hundred twenty-one thousand, four hundred twenty-one".