20120202121 has 2 divisors, whose sum is σ = 20120202122. Its totient is φ = 20120202120.

The previous prime is 20120202107. The next prime is 20120202127. The reversal of 20120202121 is 12120202102.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10457312121 + 9662890000 = 102261^2 + 98300^2 .

It is a cyclic number.

It is not a de Polignac number, because 20120202121 - 2²⁷ = 19985984393 is a prime.

It is a super-3 number, since 3×20120202121³ (a number of 32 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (20120202127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060101060 + 10060101061.

It is an arithmetic number, because the mean of its divisors is an integer number (10060101061).

Almost surely, 2^20120202121 is an apocalyptic number.

It is an amenable number.

20120202121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20120202121 is an equidigital number, since it uses as much as digits as its factorization.

20120202121 is an evil number, because the sum of its binary digits is even.

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

Adding to 20120202121 its reverse (12120202102), we get a palindrome (32240404223).

The spelling of 20120202121 in words is "twenty billion, one hundred twenty million, two hundred two thousand, one hundred twenty-one".