2121020190 has 96 divisors (see below), whose sum is σ = 5680636416. Its totient is φ = 548674560.

The previous prime is 2121020173. The next prime is 2121020191. The reversal of 2121020190 is 910201212.

It is a super-2 number, since 2×2121020190² = 8997453292775272200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121020191) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1441155 + ... + 1442625.

It is an arithmetic number, because the mean of its divisors is an integer number (59173296).

Almost surely, 2^2121020190 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2121020190, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2840318208).

2121020190 is an abundant number, since it is smaller than the sum of its proper divisors (3559616226).

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

2121020190 is a wasteful number, since it uses less digits than its factorization.

2121020190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1954 (or 1951 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 2121020190 is about 46054.5349558542. The cubic root of 2121020190 is about 1284.8376888764.

The spelling of 2121020190 in words is "two billion, one hundred twenty-one million, twenty thousand, one hundred ninety".