21011020012201 has 16 divisors (see below), whose sum is σ = 21487990987008. Its totient is φ = 20535306825600.

The previous prime is 21011020012153. The next prime is 21011020012219. The reversal of 21011020012201 is 10221002011012.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21011020012201 is a prime.

It is a super-2 number, since 2×21011020012201² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21011020012231) 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, 188011021 + ... + 188122741.

It is an arithmetic number, because the mean of its divisors is an integer number (1342999436688).

Almost surely, 2^{21011020012201} is an apocalyptic number.

It is an amenable number.

21011020012201 is a deficient number, since it is larger than the sum of its proper divisors (476970974807).

21011020012201 is a wasteful number, since it uses less digits than its factorization.

21011020012201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117312.

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

Adding to 21011020012201 its reverse (10221002011012), we get a palindrome (31232022023213).

The spelling of 21011020012201 in words is "twenty-one trillion, eleven billion, twenty million, twelve thousand, two hundred one".