21201021201 has 32 divisors (see below), whose sum is σ = 29475956736. Its totient is φ = 13543200000.

The previous prime is 21201021173. The next prime is 21201021211. The reversal of 21201021201 is 10212010212.

It is not a de Polignac number, because 21201021201 - 2⁶ = 21201021137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21201021211) 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, 2136351 + ... + 2146251.

It is an arithmetic number, because the mean of its divisors is an integer number (921123648).

Almost surely, 2^21201021201 is an apocalyptic number.

It is an amenable number.

21201021201 is a deficient number, since it is larger than the sum of its proper divisors (8274935535).

21201021201 is a wasteful number, since it uses less digits than its factorization.

21201021201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10233.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21201021201 its reverse (10212010212), we get a palindrome (31413031413).

The spelling of 21201021201 in words is "twenty-one billion, two hundred one million, twenty-one thousand, two hundred one".