21021201201 has 128 divisors (see below), whose sum is σ = 38845771776. Its totient is φ = 9757946880.

The previous prime is 21021201193. The next prime is 21021201211. The reversal of 21021201201 is 10210212012.

It is not a de Polignac number, because 21021201201 - 2³ = 21021201193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21021201211) 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 127 ways as a sum of consecutive naturals, for example, 30777406 + ... + 30778088.

It is an arithmetic number, because the mean of its divisors is an integer number (303482592).

Almost surely, 2^21021201201 is an apocalyptic number.

21021201201 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21021201201 is a deficient number, since it is larger than the sum of its proper divisors (17824570575).

21021201201 is a wasteful number, since it uses less digits than its factorization.

21021201201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1031.

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

Adding to 21021201201 its reverse (10210212012), we get a palindrome (31231413213).

It can be divided in two parts, 21021 and 201201, that added together give a palindrome (222222).

The spelling of 21021201201 in words is "twenty-one billion, twenty-one million, two hundred one thousand, two hundred one".