21202200121 has 16 divisors (see below), whose sum is σ = 22184280000. Its totient is φ = 20237652288.

The previous prime is 21202200119. The next prime is 21202200137. The reversal of 21202200121 is 12100220212.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21202200121 - 2¹ = 21202200119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21202200161) 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, 1541551 + ... + 1555243.

It is an arithmetic number, because the mean of its divisors is an integer number (1386517500).

Almost surely, 2^21202200121 is an apocalyptic number.

It is an amenable number.

21202200121 is a deficient number, since it is larger than the sum of its proper divisors (982079879).

21202200121 is a wasteful number, since it uses less digits than its factorization.

21202200121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14328.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21202200121 its reverse (12100220212), we get a palindrome (33302420333).

The spelling of 21202200121 in words is "twenty-one billion, two hundred two million, two hundred thousand, one hundred twenty-one".