2151521530646 has 32 divisors (see below), whose sum is σ = 3511637455392. Its totient is φ = 984509959680.

The previous prime is 2151521530637. The next prime is 2151521530679. The reversal of 2151521530646 is 6460351251512.

It is a congruent number.

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, 1521176 + ... + 2572356.

It is an arithmetic number, because the mean of its divisors is an integer number (109738670481).

Almost surely, 2^{2151521530646} is an apocalyptic number.

2151521530646 is a deficient number, since it is larger than the sum of its proper divisors (1360115924746).

2151521530646 is a wasteful number, since it uses less digits than its factorization.

2151521530646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1052864.

The product of its (nonzero) digits is 216000, while the sum is 41.

The spelling of 2151521530646 in words is "two trillion, one hundred fifty-one billion, five hundred twenty-one million, five hundred thirty thousand, six hundred forty-six".