2121516712 has 64 divisors (see below), whose sum is σ = 4608000000. Its totient is φ = 896930496.

The previous prime is 2121516703. The next prime is 2121516737. The reversal of 2121516712 is 2176151212.

It is a Harshad number since it is a multiple of its sum of digits (28).

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, 1414539 + ... + 1416037.

It is an arithmetic number, because the mean of its divisors is an integer number (72000000).

Almost surely, 2^2121516712 is an apocalyptic number.

It is an amenable number.

2121516712 is an abundant number, since it is smaller than the sum of its proper divisors (2486483288).

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

2121516712 is a wasteful number, since it uses less digits than its factorization.

2121516712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1838 (or 1834 counting only the distinct ones).

The product of its digits is 1680, while the sum is 28.

The square root of 2121516712 is about 46059.9252279028. The cubic root of 2121516712 is about 1284.9379394394.

Adding to 2121516712 its reverse (2176151212), we get a palindrome (4297667924).

The spelling of 2121516712 in words is "two billion, one hundred twenty-one million, five hundred sixteen thousand, seven hundred twelve".