21010001201 has 32 divisors (see below), whose sum is σ = 24733963008. Its totient is φ = 17475194880.

The previous prime is 21010001183. The next prime is 21010001251. The reversal of 21010001201 is 10210001012.

It is a cyclic number.

It is not a de Polignac number, because 21010001201 - 2¹⁴ = 21009984817 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21010001251) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17941346 + ... + 17942516.

It is an arithmetic number, because the mean of its divisors is an integer number (772936344).

Almost surely, 2^21010001201 is an apocalyptic number.

It is an amenable number.

21010001201 is a deficient number, since it is larger than the sum of its proper divisors (3723961807).

21010001201 is a wasteful number, since it uses less digits than its factorization.

21010001201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1721.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 21010001201 its reverse (10210001012), we get a palindrome (31220002213).

The spelling of 21010001201 in words is "twenty-one billion, ten million, one thousand, two hundred one".