121011090 has 64 divisors (see below), whose sum is σ = 305665920. Its totient is φ = 30620160.

The previous prime is 121011071. The next prime is 121011097. The reversal of 121011090 is 90110121.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (121011097) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44181 + ... + 46839.

It is an arithmetic number, because the mean of its divisors is an integer number (4776030).

Almost surely, 2^121011090 is an apocalyptic number.

121011090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 121011090, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (152832960).

121011090 is an abundant number, since it is smaller than the sum of its proper divisors (184654830).

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

121011090 is a wasteful number, since it uses less digits than its factorization.

121011090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2747.

The product of its (nonzero) digits is 18, while the sum is 15.

The square root of 121011090 is about 11000.5040793593. The cubic root of 121011090 is about 494.6238546373.

The spelling of 121011090 in words is "one hundred twenty-one million, eleven thousand, ninety".