2126138490 has 128 divisors (see below), whose sum is σ = 6860920320. Its totient is φ = 457380864.

The previous prime is 2126138489. The next prime is 2126138501. The reversal of 2126138490 is 948316212.

2126138490 is a `hidden beast` number, since 212 + 61 + 384 + 9 + 0 = 666.

It is a super-3 number, since 3×2126138490³ (a number of 29 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 957 + ... + 65216.

It is an arithmetic number, because the mean of its divisors is an integer number (53600940).

Almost surely, 2^2126138490 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2126138490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3430460160).

2126138490 is an abundant number, since it is smaller than the sum of its proper divisors (4734781830).

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

2126138490 is a wasteful number, since it uses less digits than its factorization.

2126138490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66213 (or 66207 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 2126138490 is about 46110.0692907742. The cubic root of 2126138490 is about 1285.8703526423.

The spelling of 2126138490 in words is "two billion, one hundred twenty-six million, one hundred thirty-eight thousand, four hundred ninety".