201000012000021 has 12 divisors (see below), whose sum is σ = 312666685333548. Its totient is φ = 123692315076864.

The previous prime is 201000012000017. The next prime is 201000012000079. The reversal of 201000012000021 is 120000210000102.

It can be written as a sum of positive squares in 2 ways, for example, as 46549426325796 + 154450585674225 = 6822714^2 + 12427815^2 .

It is not a de Polignac number, because 201000012000021 - 2² = 201000012000017 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 201000011999967 and 201000012000012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201000012000521) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 858974410140 + ... + 858974410373.

It is an arithmetic number, because the mean of its divisors is an integer number (26055557111129).

Almost surely, 2^{201000012000021} is an apocalyptic number.

It is an amenable number.

201000012000021 is a deficient number, since it is larger than the sum of its proper divisors (111666673333527).

201000012000021 is a wasteful number, since it uses less digits than its factorization.

201000012000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1717948820532 (or 1717948820529 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 201000012000021 its reverse (120000210000102), we get a palindrome (321000222000123).

The spelling of 201000012000021 in words is "two hundred one trillion, twelve million, twenty-one", and thus it is an aban number.