2121420201 has 4 divisors (see below), whose sum is σ = 2828560272. Its totient is φ = 1414280132.

The previous prime is 2121420187. The next prime is 2121420221. The reversal of 2121420201 is 1020241212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2121420201 - 2⁶ = 2121420137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2121420221) 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, 353570031 + ... + 353570036.

It is an arithmetic number, because the mean of its divisors is an integer number (707140068).

Almost surely, 2^2121420201 is an apocalyptic number.

It is an amenable number.

2121420201 is a deficient number, since it is larger than the sum of its proper divisors (707140071).

2121420201 is an equidigital number, since it uses as much as digits as its factorization.

2121420201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707140070.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 2121420201 is about 46058.8775481991. The cubic root of 2121420201 is about 1284.9184545547.

Adding to 2121420201 its reverse (1020241212), we get a palindrome (3141661413).

The spelling of 2121420201 in words is "two billion, one hundred twenty-one million, four hundred twenty thousand, two hundred one".