21010232211021 has 24 divisors (see below), whose sum is σ = 32133514101624. Its totient is φ = 13182801454080.

The previous prime is 21010232210971. The next prime is 21010232211043. The reversal of 21010232211021 is 12011223201012.

21010232211021 is a `hidden beast` number, since 210 + 1 + 0 + 2 + 322 + 110 + 21 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 6477279502500 + 14532952708521 = 2545050^2 + 3812211^2 .

It is not a de Polignac number, because 21010232211021 - 2¹⁵ = 21010232178253 is a prime.

It is a super-2 number, since 2×21010232211021² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21010232210985 and 21010232211003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010232211121) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27760395 + ... + 28507191.

It is an arithmetic number, because the mean of its divisors is an integer number (1338896420901).

Almost surely, 2^{21010232211021} is an apocalyptic number.

It is an amenable number.

21010232211021 is a deficient number, since it is larger than the sum of its proper divisors (11123281890603).

21010232211021 is a wasteful number, since it uses less digits than its factorization.

21010232211021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 930701 (or 930698 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 21010232211021 its reverse (12011223201012), we get a palindrome (33021455412033).

The spelling of 21010232211021 in words is "twenty-one trillion, ten billion, two hundred thirty-two million, two hundred eleven thousand, twenty-one".