20402001121 has 8 divisors (see below), whose sum is σ = 22541341824. Its totient is φ = 18367018560.

The previous prime is 20402001119. The next prime is 20402001133. The reversal of 20402001121 is 12110020402.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20402001121 - 2¹ = 20402001119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20402004121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26089125 + ... + 26089906.

It is an arithmetic number, because the mean of its divisors is an integer number (2817667728).

Almost surely, 2^20402001121 is an apocalyptic number.

It is an amenable number.

20402001121 is a deficient number, since it is larger than the sum of its proper divisors (2139340703).

20402001121 is a wasteful number, since it uses less digits than its factorization.

20402001121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52179071.

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

Adding to 20402001121 its reverse (12110020402), we get a palindrome (32512021523).

The spelling of 20402001121 in words is "twenty billion, four hundred two million, one thousand, one hundred twenty-one".