21421153531111 has 8 divisors (see below), whose sum is σ = 21464416512000. Its totient is φ = 21377891890488.

The previous prime is 21421153531109. The next prime is 21421153531229. The reversal of 21421153531111 is 11113535112412.

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 21421153531111 - 2¹ = 21421153531109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21421153541111) 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, 35532780 + ... + 36130606.

It is an arithmetic number, because the mean of its divisors is an integer number (2683052064000).

Almost surely, 2^{21421153531111} is an apocalyptic number.

21421153531111 is a deficient number, since it is larger than the sum of its proper divisors (43262980889).

21421153531111 is an equidigital number, since it uses as much as digits as its factorization.

21421153531111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670133.

The product of its digits is 3600, while the sum is 31.

Adding to 21421153531111 its reverse (11113535112412), we get a palindrome (32534688643523).

The spelling of 21421153531111 in words is "twenty-one trillion, four hundred twenty-one billion, one hundred fifty-three million, five hundred thirty-one thousand, one hundred eleven".