21121202201 has 8 divisors (see below), whose sum is σ = 23356946784. Its totient is φ = 18938063520.

The previous prime is 21121202177. The next prime is 21121202279. The reversal of 21121202201 is 10220212112.

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 21121202201 - 2²² = 21117007897 is a prime.

It is a super-2 number, since 2×21121202201² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21121202281) 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, 13150631 + ... + 13152236.

It is an arithmetic number, because the mean of its divisors is an integer number (2919618348).

Almost surely, 2^21121202201 is an apocalyptic number.

It is an amenable number.

21121202201 is a deficient number, since it is larger than the sum of its proper divisors (2235744583).

21121202201 is a wasteful number, since it uses less digits than its factorization.

21121202201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26302951.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21121202201 its reverse (10220212112), we get a palindrome (31341414313).

It can be divided in two parts, 21121 and 202201, that added together give a palindrome (223322).

The spelling of 21121202201 in words is "twenty-one billion, one hundred twenty-one million, two hundred two thousand, two hundred one".