1211011111990 has 32 divisors (see below), whose sum is σ = 2241226350720. Its totient is φ = 470845785600.

The previous prime is 1211011111967. The next prime is 1211011111991. The reversal of 1211011111990 is 991111101121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211011111991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5338495 + ... + 5560714.

It is an arithmetic number, because the mean of its divisors is an integer number (70038323460).

Almost surely, 2^{1211011111990} is an apocalyptic number.

1211011111990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1211011111990 is a deficient number, since it is larger than the sum of its proper divisors (1030215238730).

1211011111990 is a wasteful number, since it uses less digits than its factorization.

1211011111990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10899528.

The product of its (nonzero) digits is 162, while the sum is 28.

The spelling of 1211011111990 in words is "one trillion, two hundred eleven billion, eleven million, one hundred eleven thousand, nine hundred ninety".