21201210212 has 72 divisors (see below), whose sum is σ = 45981464256. Its totient is φ = 8375163264.

The previous prime is 21201210143. The next prime is 21201210257.

21201210212 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 3721238 + ... + 3726930.

It is an arithmetic number, because the mean of its divisors is an integer number (638631448).

Almost surely, 2^21201210212 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21201210212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22990732128).

21201210212 is an abundant number, since it is smaller than the sum of its proper divisors (24780254044).

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

21201210212 is a wasteful number, since it uses less digits than its factorization.

21201210212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6517 (or 6502 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

The spelling of 21201210212 in words is "twenty-one billion, two hundred one million, two hundred ten thousand, two hundred twelve".