21201211211012 has 24 divisors (see below), whose sum is σ = 44896682565504. Its totient is φ = 8551749059712.

The previous prime is 21201211211003. The next prime is 21201211211023. The reversal of 21201211211012 is 21011211210212.

It is a Harshad number since it is a multiple of its sum of digits (17).

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 7 ways as a sum of consecutive naturals, for example, 22270179368 + ... + 22270180319.

It is an arithmetic number, because the mean of its divisors is an integer number (1870695106896).

Almost surely, 2^{21201211211012} is an apocalyptic number.

It is an amenable number.

21201211211012 is an abundant number, since it is smaller than the sum of its proper divisors (23695471354492).

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

21201211211012 is a wasteful number, since it uses less digits than its factorization.

21201211211012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44540359715 (or 44540359713 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21201211211012 its reverse (21011211210212), we get a palindrome (42212422421224).

The spelling of 21201211211012 in words is "twenty-one trillion, two hundred one billion, two hundred eleven million, two hundred eleven thousand, twelve".