11211555450 has 48 divisors (see below), whose sum is σ = 27850244256. Its totient is φ = 2984846400.

The previous prime is 11211555409. The next prime is 11211555557. The reversal of 11211555450 is 5455511211.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30985 + ... + 152915.

It is an arithmetic number, because the mean of its divisors is an integer number (580213422).

Almost surely, 2^11211555450 is an apocalyptic number.

11211555450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11211555450 is an abundant number, since it is smaller than the sum of its proper divisors (16638688806).

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

11211555450 is a wasteful number, since it uses less digits than its factorization.

11211555450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122559 (or 122554 counting only the distinct ones).

The product of its (nonzero) digits is 5000, while the sum is 30.

The spelling of 11211555450 in words is "eleven billion, two hundred eleven million, five hundred fifty-five thousand, four hundred fifty".