21012011311 has 8 divisors (see below), whose sum is σ = 21167627600. Its totient is φ = 20856458880.

The previous prime is 21012011299. The next prime is 21012011347. The reversal of 21012011311 is 11311021012.

It is a happy number.

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 21012011311 - 2¹⁵ = 21011978543 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21012011291 and 21012011300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012011381) 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, 796135 + ... + 822103.

It is an arithmetic number, because the mean of its divisors is an integer number (2645953450).

Almost surely, 2^21012011311 is an apocalyptic number.

21012011311 is a deficient number, since it is larger than the sum of its proper divisors (155616289).

21012011311 is a wasteful number, since it uses less digits than its factorization.

21012011311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31929.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 21012011311 its reverse (11311021012), we get a palindrome (32323032323).

The spelling of 21012011311 in words is "twenty-one billion, twelve million, eleven thousand, three hundred eleven".