2151521056603 has 4 divisors (see below), whose sum is σ = 2177442997128. Its totient is φ = 2125599116080.

The previous prime is 2151521056577. The next prime is 2151521056621. The reversal of 2151521056603 is 3066501251512.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2151521056603 - 2²¹ = 2151518959451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2151521056693) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12960970138 + ... + 12960970303.

It is an arithmetic number, because the mean of its divisors is an integer number (544360749282).

Almost surely, 2^{2151521056603} is an apocalyptic number.

2151521056603 is a deficient number, since it is larger than the sum of its proper divisors (25921940525).

2151521056603 is an equidigital number, since it uses as much as digits as its factorization.

2151521056603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25921940524.

The product of its (nonzero) digits is 54000, while the sum is 37.

The spelling of 2151521056603 in words is "two trillion, one hundred fifty-one billion, five hundred twenty-one million, fifty-six thousand, six hundred three".