21200002122 has 16 divisors (see below), whose sum is σ = 45661543200. Its totient is φ = 6523077552.

The previous prime is 21200002097. The next prime is 21200002151. The reversal of 21200002122 is 22120000212.

It is a junction number, because it is equal to n+sod(n) for n = 21200002098 and 21200002107.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135897372 + ... + 135897527.

It is an arithmetic number, because the mean of its divisors is an integer number (2853846450).

Almost surely, 2^21200002122 is an apocalyptic number.

21200002122 is an abundant number, since it is smaller than the sum of its proper divisors (24461541078).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21200002122 is a wasteful number, since it uses less digits than its factorization.

21200002122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271794917.

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 21200002122 its reverse (22120000212), we get a palindrome (43320002334).

It can be divided in two parts, 2120000212 and 2, that multiplied together give a palindrome (4240000424).

The spelling of 21200002122 in words is "twenty-one billion, two hundred million, two thousand, one hundred twenty-two".