2125128492 has 216 divisors, whose sum is σ = 6050706480. Its totient is φ = 626745600.

The previous prime is 2125128487. The next prime is 2125128527. The reversal of 2125128492 is 2948215212.

2125128492 is a `hidden beast` number, since 21 + 25 + 128 + 492 = 666.

It is a super-2 number, since 2×2125128492² = 9032342215020388128, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 34838142 + ... + 34838202.

It is an arithmetic number, because the mean of its divisors is an integer number (28012530).

Almost surely, 2^2125128492 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2125128492, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3025353240).

2125128492 is an abundant number, since it is smaller than the sum of its proper divisors (3925577988).

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

2125128492 is a wasteful number, since it uses less digits than its factorization.

2125128492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205 (or 169 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 2125128492 is about 46099.1159568164. The cubic root of 2125128492 is about 1285.6667076785. Note that the first 3 decimals are identical.

The spelling of 2125128492 in words is "two billion, one hundred twenty-five million, one hundred twenty-eight thousand, four hundred ninety-two".