201001211000021 has 2 divisors, whose sum is σ = 201001211000022. Its totient is φ = 201001211000020.

The previous prime is 201001211000017. The next prime is 201001211000077. The reversal of 201001211000021 is 120000112100102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 133525073643025 + 67476137356996 = 11555305^2 + 8214386^2 .

It is a cyclic number.

It is not a de Polignac number, because 201001211000021 - 2² = 201001211000017 is a prime.

It is a super-3 number, since 3×201001211000021³ (a number of 44 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 201001210999966 and 201001211000011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201001211009021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100500605500010 + 100500605500011.

It is an arithmetic number, because the mean of its divisors is an integer number (100500605500011).

Almost surely, 2^{201001211000021} is an apocalyptic number.

It is an amenable number.

201001211000021 is a deficient number, since it is larger than the sum of its proper divisors (1).

201001211000021 is an equidigital number, since it uses as much as digits as its factorization.

201001211000021 is an odious number, because the sum of its binary digits is odd.

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

Adding to 201001211000021 its reverse (120000112100102), we get a palindrome (321001323100123).

The spelling of 201001211000021 in words is "two hundred one trillion, one billion, two hundred eleven million, twenty-one", and thus it is an aban number.