201210721245 has 32 divisors (see below), whose sum is σ = 362235916800. Its totient is φ = 105953994432.

The previous prime is 201210721241. The next prime is 201210721249. The reversal of 201210721245 is 542127012102.

It is a happy number.

201210721245 is a `hidden beast` number, since 201 + 210 + 7 + 2 + 1 + 245 = 666.

It is an interprime number because it is at equal distance from previous prime (201210721241) and next prime (201210721249).

It is not a de Polignac number, because 201210721245 - 2² = 201210721241 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201210721241) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9422562 + ... + 9443891.

It is an arithmetic number, because the mean of its divisors is an integer number (11319872400).

Almost surely, 2^201210721245 is an apocalyptic number.

It is an amenable number.

201210721245 is a deficient number, since it is larger than the sum of its proper divisors (161025195555).

201210721245 is a wasteful number, since it uses less digits than its factorization.

201210721245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18866546 (or 18866540 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

Adding to 201210721245 its reverse (542127012102), we get a palindrome (743337733347).

The spelling of 201210721245 in words is "two hundred one billion, two hundred ten million, seven hundred twenty-one thousand, two hundred forty-five".