21121315311 has 8 divisors (see below), whose sum is σ = 29386177920. Its totient is φ = 13468664792.

The previous prime is 21121315307. The next prime is 21121315333. The reversal of 21121315311 is 11351312112.

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 21121315311 - 2² = 21121315307 is a prime.

It is a super-2 number, since 2×21121315311² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121315301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153052941 + ... + 153053078.

It is an arithmetic number, because the mean of its divisors is an integer number (3673272240).

Almost surely, 2^21121315311 is an apocalyptic number.

21121315311 is a deficient number, since it is larger than the sum of its proper divisors (8264862609).

21121315311 is a wasteful number, since it uses less digits than its factorization.

21121315311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306106045.

The product of its digits is 180, while the sum is 21.

Adding to 21121315311 its reverse (11351312112), we get a palindrome (32472627423).

The spelling of 21121315311 in words is "twenty-one billion, one hundred twenty-one million, three hundred fifteen thousand, three hundred eleven".