21011201013021 has 16 divisors (see below), whose sum is σ = 29401952075136. Its totient is φ = 13320999344576.

The previous prime is 21011201012999. The next prime is 21011201013037. The reversal of 21011201013021 is 12031010211012.

It is a cyclic number.

It is not a de Polignac number, because 21011201013021 - 2³⁰ = 21010127271197 is a prime.

It is a super-2 number, since 2×21011201013021² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011201013091) 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, 880075230 + ... + 880099103.

It is an arithmetic number, because the mean of its divisors is an integer number (1837622004696).

Almost surely, 2^{21011201013021} is an apocalyptic number.

It is an amenable number.

21011201013021 is a deficient number, since it is larger than the sum of its proper divisors (8390751062115).

21011201013021 is a wasteful number, since it uses less digits than its factorization.

21011201013021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1760174532.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 21011201013021 its reverse (12031010211012), we get a palindrome (33042211224033).

The spelling of 21011201013021 in words is "twenty-one trillion, eleven billion, two hundred one million, thirteen thousand, twenty-one".