21210221102 has 32 divisors (see below), whose sum is σ = 37062427584. Its totient is φ = 8915961600.

The previous prime is 21210221101. The next prime is 21210221143. The reversal of 21210221102 is 20112201212.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210221101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 127652 + ... + 242312.

It is an arithmetic number, because the mean of its divisors is an integer number (1158200862).

Almost surely, 2^21210221102 is an apocalyptic number.

21210221102 is a deficient number, since it is larger than the sum of its proper divisors (15852206482).

21210221102 is a wasteful number, since it uses less digits than its factorization.

21210221102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114924.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21210221102 its reverse (20112201212), we get a palindrome (41322422314).

The spelling of 21210221102 in words is "twenty-one billion, two hundred ten million, two hundred twenty-one thousand, one hundred two".