21100021011021 has 16 divisors (see below), whose sum is σ = 28817091065664. Its totient is φ = 13725485485824.

The previous prime is 21100021010983. The next prime is 21100021011037. The reversal of 21100021011021 is 12011012000112.

It is not a de Polignac number, because 21100021011021 - 2¹¹ = 21100021008973 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21100021010988 and 21100021011006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100021011071) 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, 83582286 + ... + 83834351.

It is an arithmetic number, because the mean of its divisors is an integer number (1801068191604).

Almost surely, 2^{21100021011021} is an apocalyptic number.

It is an amenable number.

21100021011021 is a deficient number, since it is larger than the sum of its proper divisors (7717070054643).

21100021011021 is a wasteful number, since it uses less digits than its factorization.

21100021011021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167417660.

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

Adding to 21100021011021 its reverse (12011012000112), we get a palindrome (33111033011133).

The spelling of 21100021011021 in words is "twenty-one trillion, one hundred billion, twenty-one million, eleven thousand, twenty-one".