20022000021121 has 6 divisors (see below), whose sum is σ = 23290897983810. Its totient is φ = 17161714303776.

The previous prime is 20022000021097. The next prime is 20022000021131. The reversal of 20022000021121 is 12112000022002.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 11950406508096 + 8071593513025 = 3456936^2 + 2841055^2 .

It is not a de Polignac number, because 20022000021121 - 2¹⁹ = 20021999496833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20022000021131) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 204306122616 + ... + 204306122713.

It is an arithmetic number, because the mean of its divisors is an integer number (3881816330635).

Almost surely, 2^{20022000021121} is an apocalyptic number.

It is an amenable number.

20022000021121 is a deficient number, since it is larger than the sum of its proper divisors (3268897962689).

20022000021121 is an equidigital number, since it uses as much as digits as its factorization.

20022000021121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408612245343 (or 408612245336 counting only the distinct ones).

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

Adding to 20022000021121 its reverse (12112000022002), we get a palindrome (32134000043123).

The spelling of 20022000021121 in words is "twenty trillion, twenty-two billion, twenty-one thousand, one hundred twenty-one".