201001012121 has 16 divisors (see below), whose sum is σ = 247548465024. Its totient is φ = 158929236864.

The previous prime is 201001012117. The next prime is 201001012123. The reversal of 201001012121 is 121210100102.

It is a cyclic number.

It is not a de Polignac number, because 201001012121 - 2² = 201001012117 is a prime.

It is not an unprimeable number, because it can be changed into a prime (201001012123) 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, 586556 + ... + 863741.

It is an arithmetic number, because the mean of its divisors is an integer number (15471779064).

Almost surely, 2^201001012121 is an apocalyptic number.

It is an amenable number.

201001012121 is a deficient number, since it is larger than the sum of its proper divisors (46547452903).

201001012121 is a wasteful number, since it uses less digits than its factorization.

201001012121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1451840.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 201001012121 its reverse (121210100102), we get a palindrome (322211112223).

The spelling of 201001012121 in words is "two hundred one billion, one million, twelve thousand, one hundred twenty-one".