21012010311 has 16 divisors (see below), whose sum is σ = 28468518624. Its totient is φ = 13783425024.

The previous prime is 21012010259. The next prime is 21012010361. The reversal of 21012010311 is 11301021012.

It is not a de Polignac number, because 21012010311 - 2¹⁴ = 21011993927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012010361) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 158346 + ... + 259031.

It is an arithmetic number, because the mean of its divisors is an integer number (1779282414).

Almost surely, 2^21012010311 is an apocalyptic number.

21012010311 is a deficient number, since it is larger than the sum of its proper divisors (7456508313).

21012010311 is a wasteful number, since it uses less digits than its factorization.

21012010311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417650.

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

Adding to 21012010311 its reverse (11301021012), we get a palindrome (32313031323).

The spelling of 21012010311 in words is "twenty-one billion, twelve million, ten thousand, three hundred eleven".