20011202022121 has 16 divisors (see below), whose sum is σ = 22311789897600. Its totient is φ = 17836179118848.

The previous prime is 20011202022107. The next prime is 20011202022137. The reversal of 20011202022121 is 12122020211002.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20011202022121 - 2⁵ = 20011202022089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20011202022095 and 20011202022104.

It is not an unprimeable number, because it can be changed into a prime (20011202022521) 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, 10632981 + ... + 12372658.

It is an arithmetic number, because the mean of its divisors is an integer number (1394486868600).

Almost surely, 2^{20011202022121} is an apocalyptic number.

It is an amenable number.

20011202022121 is a deficient number, since it is larger than the sum of its proper divisors (2300587875479).

20011202022121 is a wasteful number, since it uses less digits than its factorization.

20011202022121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23008368.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 20011202022121 its reverse (12122020211002), we get a palindrome (32133222233123).

The spelling of 20011202022121 in words is "twenty trillion, eleven billion, two hundred two million, twenty-two thousand, one hundred twenty-one".