21011200011021 has 64 divisors (see below), whose sum is σ = 32779856148480. Its totient is φ = 11835284048640.

The previous prime is 21011200010993. The next prime is 21011200011029. The reversal of 21011200011021 is 12011000211012.

It is not a de Polignac number, because 21011200011021 - 2²¹ = 21011197913869 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21011200010988 and 21011200011006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011200011029) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 787129351 + ... + 787156043.

It is an arithmetic number, because the mean of its divisors is an integer number (512185252320).

Almost surely, 2^{21011200011021} is an apocalyptic number.

It is an amenable number.

21011200011021 is a deficient number, since it is larger than the sum of its proper divisors (11768656137459).

21011200011021 is a wasteful number, since it uses less digits than its factorization.

21011200011021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50466.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21011200011021 its reverse (12011000211012), we get a palindrome (33022200222033).

The spelling of 21011200011021 in words is "twenty-one trillion, eleven billion, two hundred million, eleven thousand, twenty-one".