201230220021 has 16 divisors (see below), whose sum is σ = 277875007488. Its totient is φ = 129449860400.

The previous prime is 201230220019. The next prime is 201230220043. The reversal of 201230220021 is 120022032102.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 201230220021 - 2¹ = 201230220019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201230020021) 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, 10040445 + ... + 10060466.

It is an arithmetic number, because the mean of its divisors is an integer number (17367187968).

Almost surely, 2^201230220021 is an apocalyptic number.

It is an amenable number.

201230220021 is a deficient number, since it is larger than the sum of its proper divisors (76644787467).

201230220021 is a wasteful number, since it uses less digits than its factorization.

201230220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20101032.

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 201230220021 its reverse (120022032102), we get a palindrome (321252252123).

The spelling of 201230220021 in words is "two hundred one billion, two hundred thirty million, two hundred twenty thousand, twenty-one".