21211012312 has 16 divisors (see below), whose sum is σ = 45452169360. Its totient is φ = 9090433824.

The previous prime is 21211012301. The next prime is 21211012357. The reversal of 21211012312 is 21321011212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189383983 + ... + 189384094.

It is an arithmetic number, because the mean of its divisors is an integer number (2840760585).

Almost surely, 2^21211012312 is an apocalyptic number.

It is an amenable number.

21211012312 is an abundant number, since it is smaller than the sum of its proper divisors (24241157048).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21211012312 is a wasteful number, since it uses less digits than its factorization.

21211012312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378768090 (or 378768086 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21211012312 its reverse (21321011212), we get a palindrome (42532023524).

It can be divided in two parts, 212110 and 12312, that added together give a palindrome (224422).

The spelling of 21211012312 in words is "twenty-one billion, two hundred eleven million, twelve thousand, three hundred twelve".