2151247240 has 64 divisors (see below), whose sum is σ = 4889808000. Its totient is φ = 851747328.

The previous prime is 2151247237. The next prime is 2151247349. The reversal of 2151247240 is 427421512.

It is a junction number, because it is equal to n+sod(n) for n = 2151247199 and 2151247208.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2050236 + ... + 2051284.

It is an arithmetic number, because the mean of its divisors is an integer number (76403250).

Almost surely, 2^2151247240 is an apocalyptic number.

2151247240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2151247240 is an abundant number, since it is smaller than the sum of its proper divisors (2738560760).

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

2151247240 is a wasteful number, since it uses less digits than its factorization.

2151247240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1534 (or 1530 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 28.

The square root of 2151247240 is about 46381.5398623202. The cubic root of 2151247240 is about 1290.9124086105.

Adding to 2151247240 its reverse (427421512), we get a palindrome (2578668752).

The spelling of 2151247240 in words is "two billion, one hundred fifty-one million, two hundred forty-seven thousand, two hundred forty".