20122121121 has 16 divisors (see below), whose sum is σ = 26997680640. Its totient is φ = 13330869120.

The previous prime is 20122121101. The next prime is 20122121141. The reversal of 20122121121 is 12112122102.

It is an interprime number because it is at equal distance from previous prime (20122121101) and next prime (20122121141).

It is not a de Polignac number, because 20122121121 - 2¹³ = 20122112929 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20122121121.

It is not an unprimeable number, because it can be changed into a prime (20122121101) 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, 354231 + ... + 407091.

It is an arithmetic number, because the mean of its divisors is an integer number (1687355040).

Almost surely, 2^20122121121 is an apocalyptic number.

It is an amenable number.

20122121121 is a deficient number, since it is larger than the sum of its proper divisors (6875559519).

20122121121 is a wasteful number, since it uses less digits than its factorization.

20122121121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53656.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 20122121121 its reverse (12112122102), we get a palindrome (32234243223).

The spelling of 20122121121 in words is "twenty billion, one hundred twenty-two million, one hundred twenty-one thousand, one hundred twenty-one".