1221080190 has 64 divisors (see below), whose sum is σ = 3213914112. Its totient is φ = 294454400.

The previous prime is 1221080171. The next prime is 1221080207. The reversal of 1221080190 is 910801221.

It is a super-2 number, since 2×1221080190² = 2982073660820872200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1221080190.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53344 + ... + 72716.

It is an arithmetic number, because the mean of its divisors is an integer number (50217408).

Almost surely, 2^1221080190 is an apocalyptic number.

1221080190 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 1221080190, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1606957056).

1221080190 is an abundant number, since it is smaller than the sum of its proper divisors (1992833922).

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

1221080190 is a wasteful number, since it uses less digits than its factorization.

1221080190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19585.

The product of its (nonzero) digits is 288, while the sum is 24.

The square root of 1221080190 is about 34943.9578468152. The cubic root of 1221080190 is about 1068.8449964463.

The spelling of 1221080190 in words is "one billion, two hundred twenty-one million, eighty thousand, one hundred ninety".