21121311201 has 8 divisors (see below), whose sum is σ = 28164046464. Its totient is φ = 14079725040.

The previous prime is 21121311191. The next prime is 21121311307. The reversal of 21121311201 is 10211312112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21121311201 - 2⁶ = 21121311137 is a prime.

It is a super-2 number, since 2×21121311201² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21121310201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 243430 + ... + 318591.

It is an arithmetic number, because the mean of its divisors is an integer number (3520505808).

Almost surely, 2^21121311201 is an apocalyptic number.

It is an amenable number.

21121311201 is a deficient number, since it is larger than the sum of its proper divisors (7042735263).

21121311201 is a wasteful number, since it uses less digits than its factorization.

21121311201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 574551.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 21121311201 its reverse (10211312112), we get a palindrome (31332623313).

The spelling of 21121311201 in words is "twenty-one billion, one hundred twenty-one million, three hundred eleven thousand, two hundred one".