22021200121 has 4 divisors (see below), whose sum is σ = 23316564852. Its totient is φ = 20725835392.

The previous prime is 22021200107. The next prime is 22021200167. The reversal of 22021200121 is 12100212022.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18717249721 + 3303950400 = 136811^2 + 57480^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22021200121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22021200191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 647682340 + ... + 647682373.

It is an arithmetic number, because the mean of its divisors is an integer number (5829141213).

Almost surely, 2^22021200121 is an apocalyptic number.

It is an amenable number.

22021200121 is a deficient number, since it is larger than the sum of its proper divisors (1295364731).

22021200121 is a wasteful number, since it uses less digits than its factorization.

22021200121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1295364730.

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

Adding to 22021200121 its reverse (12100212022), we get a palindrome (34121412143).

It can be divided in two parts, 220212001 and 21, that added together give a palindrome (220212022).

The spelling of 22021200121 in words is "twenty-two billion, twenty-one million, two hundred thousand, one hundred twenty-one".