1211100116408 has 32 divisors (see below), whose sum is σ = 2794846424160. Its totient is φ = 479116529280.

The previous prime is 1211100116407. The next prime is 1211100116437. The reversal of 1211100116408 is 8046110011121.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211100116407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 831798803 + ... + 831800258.

It is an arithmetic number, because the mean of its divisors is an integer number (87338950755).

Almost surely, 2^{1211100116408} is an apocalyptic number.

It is an amenable number.

1211100116408 is an abundant number, since it is smaller than the sum of its proper divisors (1583746307752).

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

1211100116408 is a wasteful number, since it uses less digits than its factorization.

1211100116408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1663599087 (or 1663599083 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 26.

Adding to 1211100116408 its reverse (8046110011121), we get a palindrome (9257210127529).

The spelling of 1211100116408 in words is "one trillion, two hundred eleven billion, one hundred million, one hundred sixteen thousand, four hundred eight".