21000211130021 has 16 divisors (see below), whose sum is σ = 22081602533760. Its totient is φ = 19932862709760.

The previous prime is 21000211129993. The next prime is 21000211130081. The reversal of 21000211130021 is 12003111200012.

It is a cyclic number.

It is not a de Polignac number, because 21000211130021 - 2¹⁸ = 21000210867877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21000211129978 and 21000211130005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000211130081) 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, 66952085 + ... + 67265013.

It is an arithmetic number, because the mean of its divisors is an integer number (1380100158360).

Almost surely, 2^{21000211130021} is an apocalyptic number.

It is an amenable number.

21000211130021 is a deficient number, since it is larger than the sum of its proper divisors (1081391403739).

21000211130021 is a wasteful number, since it uses less digits than its factorization.

21000211130021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335356.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21000211130021 its reverse (12003111200012), we get a palindrome (33003322330033).

The spelling of 21000211130021 in words is "twenty-one trillion, two hundred eleven million, one hundred thirty thousand, twenty-one".