201621306445 has 16 divisors (see below), whose sum is σ = 260567717760. Its totient is φ = 148883321664.

The previous prime is 201621306443. The next prime is 201621306449. The reversal of 201621306445 is 544603126102.

It is a cyclic number.

It is not a de Polignac number, because 201621306445 - 2¹ = 201621306443 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 201621306445.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201621306443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1985416 + ... + 2084494.

It is an arithmetic number, because the mean of its divisors is an integer number (16285482360).

Almost surely, 2^201621306445 is an apocalyptic number.

It is an amenable number.

201621306445 is a deficient number, since it is larger than the sum of its proper divisors (58946411315).

201621306445 is a wasteful number, since it uses less digits than its factorization.

201621306445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130404.

The product of its (nonzero) digits is 34560, while the sum is 34.

The spelling of 201621306445 in words is "two hundred one billion, six hundred twenty-one million, three hundred six thousand, four hundred forty-five".