201245120021 has 16 divisors (see below), whose sum is σ = 229488128640. Its totient is φ = 174688081920.

The previous prime is 201245119993. The next prime is 201245120047. The reversal of 201245120021 is 120021542102.

It is a de Polignac number, because none of the positive numbers 2^k-201245120021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201245119975 and 201245120002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201245120221) 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, 555020 + ... + 842933.

It is an arithmetic number, because the mean of its divisors is an integer number (14343008040).

Almost surely, 2^201245120021 is an apocalyptic number.

It is an amenable number.

201245120021 is a deficient number, since it is larger than the sum of its proper divisors (28243008619).

201245120021 is a wasteful number, since it uses less digits than its factorization.

201245120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1398556.

The product of its (nonzero) digits is 320, while the sum is 20.

Adding to 201245120021 its reverse (120021542102), we get a palindrome (321266662123).

The spelling of 201245120021 in words is "two hundred one billion, two hundred forty-five million, one hundred twenty thousand, twenty-one".