1211209999722 has 24 divisors (see below), whose sum is σ = 2680124256576. Its totient is φ = 395146524456.

The previous prime is 1211209999721. The next prime is 1211209999733. The reversal of 1211209999722 is 2279999021121.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1211209999721) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 715844308 + ... + 715845999.

It is an arithmetic number, because the mean of its divisors is an integer number (111671844024).

Almost surely, 2^{1211209999722} is an apocalyptic number.

1211209999722 is an abundant number, since it is smaller than the sum of its proper divisors (1468914256854).

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

1211209999722 is a wasteful number, since it uses less digits than its factorization.

1211209999722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1431690362 (or 1431690359 counting only the distinct ones).

The product of its (nonzero) digits is 734832, while the sum is 54.

The spelling of 1211209999722 in words is "one trillion, two hundred eleven billion, two hundred nine million, nine hundred ninety-nine thousand, seven hundred twenty-two".