21210121311 has 16 divisors (see below), whose sum is σ = 28709253120. Its totient is φ = 13926098880.

The previous prime is 21210121307. The next prime is 21210121333. The reversal of 21210121311 is 11312101212.

It is not a de Polignac number, because 21210121311 - 2² = 21210121307 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210121411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81250 + ... + 221408.

It is an arithmetic number, because the mean of its divisors is an integer number (1794328320).

Almost surely, 2^21210121311 is an apocalyptic number.

21210121311 is a deficient number, since it is larger than the sum of its proper divisors (7499131809).

21210121311 is a wasteful number, since it uses less digits than its factorization.

21210121311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140926.

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

Adding to 21210121311 its reverse (11312101212), we get a palindrome (32522222523).

The spelling of 21210121311 in words is "twenty-one billion, two hundred ten million, one hundred twenty-one thousand, three hundred eleven".