2151521530645 has 8 divisors (see below), whose sum is σ = 2614507176960. Its totient is φ = 1699429664400.

The previous prime is 2151521530637. The next prime is 2151521530679. The reversal of 2151521530645 is 5460351251512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2151521530645 - 2³ = 2151521530637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2151521530598 and 2151521530607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2723444581 + ... + 2723445370.

It is an arithmetic number, because the mean of its divisors is an integer number (326813397120).

Almost surely, 2^{2151521530645} is an apocalyptic number.

It is an amenable number.

2151521530645 is a deficient number, since it is larger than the sum of its proper divisors (462985646315).

2151521530645 is an equidigital number, since it uses as much as digits as its factorization.

2151521530645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5446890035.

The product of its (nonzero) digits is 180000, while the sum is 40.

The spelling of 2151521530645 in words is "two trillion, one hundred fifty-one billion, five hundred twenty-one million, five hundred thirty thousand, six hundred forty-five".