2151239000 has 64 divisors (see below), whose sum is σ = 5055523200. Its totient is φ = 856800000.

The previous prime is 2151238997. The next prime is 2151239003. The reversal of 2151239000 is 9321512.

It is an interprime number because it is at equal distance from previous prime (2151238997) and next prime (2151239003).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2151239003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 234500 + ... + 243500.

It is an arithmetic number, because the mean of its divisors is an integer number (78992550).

Almost surely, 2^2151239000 is an apocalyptic number.

2151239000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2151239000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2527761600).

2151239000 is an abundant number, since it is smaller than the sum of its proper divisors (2904284200).

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

2151239000 is a wasteful number, since it uses less digits than its factorization.

2151239000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9261 (or 9247 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 2151239000 is about 46381.4510337915. The cubic root of 2151239000 is about 1290.9107603989.

The spelling of 2151239000 in words is "two billion, one hundred fifty-one million, two hundred thirty-nine thousand".