1211000111010 has 96 divisors (see below), whose sum is σ = 3338010703872. Its totient is φ = 304069749120.

The previous prime is 1211000110987. The next prime is 1211000111021. The reversal of 1211000111010 is 101110001121.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 1211000110983 and 1211000111001.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5762314 + ... + 5968773.

It is an arithmetic number, because the mean of its divisors is an integer number (34770944832).

Almost surely, 2^{1211000111010} is an apocalyptic number.

1211000111010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1211000111010 is an abundant number, since it is smaller than the sum of its proper divisors (2127010592862).

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

1211000111010 is a wasteful number, since it uses less digits than its factorization.

1211000111010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11731168 (or 11731165 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 9.

Adding to 1211000111010 its reverse (101110001121), we get a palindrome (1312110112131).

The spelling of 1211000111010 in words is "one trillion, two hundred eleven billion, one hundred eleven thousand, ten".