21211211021012 has 24 divisors (see below), whose sum is σ = 37276719782400. Its totient is φ = 10560723913376.

The previous prime is 21211211020997. The next prime is 21211211021083. The reversal of 21211211021012 is 21012011211212.

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, 19811573 + ... + 20854755.

It is an arithmetic number, because the mean of its divisors is an integer number (1553196657600).

Almost surely, 2^{21211211021012} is an apocalyptic number.

It is an amenable number.

21211211021012 is a deficient number, since it is larger than the sum of its proper divisors (16065508761388).

21211211021012 is a wasteful number, since it uses less digits than its factorization.

21211211021012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1064695 (or 1064693 counting only the distinct ones).

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

Adding to 21211211021012 its reverse (21012011211212), we get a palindrome (42223222232224).

The spelling of 21211211021012 in words is "twenty-one trillion, two hundred eleven billion, two hundred eleven million, twenty-one thousand, twelve".