21221401201 has 48 divisors (see below), whose sum is σ = 28791465472. Its totient is φ = 15220275840.

The previous prime is 21221401181. The next prime is 21221401211. The reversal of 21221401201 is 10210412212.

It is not a de Polignac number, because 21221401201 - 2²⁹ = 20684530289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21221401211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4104520 + ... + 4109686.

Almost surely, 2^21221401201 is an apocalyptic number.

It is an amenable number.

21221401201 is a deficient number, since it is larger than the sum of its proper divisors (7570064271).

21221401201 is a wasteful number, since it uses less digits than its factorization.

21221401201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5582 (or 5571 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21221401201 its reverse (10210412212), we get a palindrome (31431813413).

The spelling of 21221401201 in words is "twenty-one billion, two hundred twenty-one million, four hundred one thousand, two hundred one".