2151621318 has 32 divisors (see below), whose sum is σ = 5365082880. Its totient is φ = 558862560.

The previous prime is 2151621293. The next prime is 2151621323. The reversal of 2151621318 is 8131261512.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2328133 + ... + 2329056.

It is an arithmetic number, because the mean of its divisors is an integer number (167658840).

Almost surely, 2^2151621318 is an apocalyptic number.

2151621318 is an abundant number, since it is smaller than the sum of its proper divisors (3213461562).

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

2151621318 is a wasteful number, since it uses less digits than its factorization.

2151621318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4657212.

The product of its digits is 2880, while the sum is 30.

The square root of 2151621318 is about 46385.5723043276. The cubic root of 2151621318 is about 1290.9872293835.

The spelling of 2151621318 in words is "two billion, one hundred fifty-one million, six hundred twenty-one thousand, three hundred eighteen".