201001212121 has 16 divisors (see below), whose sum is σ = 213917760000. Its totient is φ = 188207209728.

The previous prime is 201001212103. The next prime is 201001212131. The reversal of 201001212121 is 121212100102.

It is a cyclic number.

It is not a de Polignac number, because 201001212121 - 2⁵ = 201001212089 is a prime.

It is a super-2 number, since 2×201001212121² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201001212131) 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, 6121255 + ... + 6154003.

It is an arithmetic number, because the mean of its divisors is an integer number (13369860000).

Almost surely, 2^201001212121 is an apocalyptic number.

It is an amenable number.

201001212121 is a deficient number, since it is larger than the sum of its proper divisors (12916547879).

201001212121 is a wasteful number, since it uses less digits than its factorization.

201001212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34608.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 201001212121 its reverse (121212100102), we get a palindrome (322213312223).

The spelling of 201001212121 in words is "two hundred one billion, one million, two hundred twelve thousand, one hundred twenty-one".