201121634020 has 24 divisors (see below), whose sum is σ = 422455764024. Its totient is φ = 80429542656.

The previous prime is 201121634017. The next prime is 201121634047. The reversal of 201121634020 is 20436121102.

It can be written as a sum of positive squares in 4 ways, for example, as 120098288704 + 81023345316 = 346552^2 + 284646^2 .

It is a junction number, because it is equal to n+sod(n) for n = 201121633982 and 201121634000.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1107987 + ... + 1276666.

It is an arithmetic number, because the mean of its divisors is an integer number (17602323501).

Almost surely, 2^201121634020 is an apocalyptic number.

201121634020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201121634020 is an abundant number, since it is smaller than the sum of its proper divisors (221334130004).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

201121634020 is a wasteful number, since it uses less digits than its factorization.

201121634020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2388879 (or 2388877 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 201121634020 its reverse (20436121102), we get a palindrome (221557755122).

The spelling of 201121634020 in words is "two hundred one billion, one hundred twenty-one million, six hundred thirty-four thousand, twenty".