21321402201 has 64 divisors (see below), whose sum is σ = 36221091840. Its totient is φ = 12269473920.

The previous prime is 21321402199. The next prime is 21321402211. The reversal of 21321402201 is 10220412312.

It is a happy number.

It is not a de Polignac number, because 21321402201 - 2¹ = 21321402199 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21321402211) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 924456 + ... + 947238.

It is an arithmetic number, because the mean of its divisors is an integer number (565954560).

Almost surely, 2^21321402201 is an apocalyptic number.

It is an amenable number.

21321402201 is a deficient number, since it is larger than the sum of its proper divisors (14899689639).

21321402201 is a wasteful number, since it uses less digits than its factorization.

21321402201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22963 (or 22957 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21321402201 its reverse (10220412312), we get a palindrome (31541814513).

The spelling of 21321402201 in words is "twenty-one billion, three hundred twenty-one million, four hundred two thousand, two hundred one".