21201220211102 has 16 divisors (see below), whose sum is σ = 31825558806912. Its totient is φ = 10592703366360.

The previous prime is 21201220211077. The next prime is 21201220211107. The reversal of 21201220211102 is 20111202210212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201220211107) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14754713 + ... + 16127739.

It is an arithmetic number, because the mean of its divisors is an integer number (1989097425432).

Almost surely, 2^{21201220211102} is an apocalyptic number.

21201220211102 is a deficient number, since it is larger than the sum of its proper divisors (10624338595810).

21201220211102 is a wasteful number, since it uses less digits than its factorization.

21201220211102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1378783.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21201220211102 its reverse (20111202210212), we get a palindrome (41312422421314).

The spelling of 21201220211102 in words is "twenty-one trillion, two hundred one billion, two hundred twenty million, two hundred eleven thousand, one hundred two".