21010213312 has 56 divisors (see below), whose sum is σ = 45499538160. Its totient is φ = 9546485760.

The previous prime is 21010213309. The next prime is 21010213331. The reversal of 21010213312 is 21331201012.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2973688 + ... + 2980744.

Almost surely, 2^21010213312 is an apocalyptic number.

21010213312 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21010213312 is an abundant number, since it is smaller than the sum of its proper divisors (24489324848).

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

21010213312 is a wasteful number, since it uses less digits than its factorization.

21010213312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11309 (or 11299 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21010213312 its reverse (21331201012), we get a palindrome (42341414324).

The spelling of 21010213312 in words is "twenty-one billion, ten million, two hundred thirteen thousand, three hundred twelve".