21261022320411 has 24 divisors (see below), whose sum is σ = 30860089796016. Its totient is φ = 14105074959360.

The previous prime is 21261022320353. The next prime is 21261022320437. The reversal of 21261022320411 is 11402322016212.

21261022320411 is a `hidden beast` number, since 2 + 1 + 2 + 6 + 1 + 0 + 223 + 20 + 411 = 666.

It is not a de Polignac number, because 21261022320411 - 2¹¹ = 21261022318363 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21261022320211) 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, 5254930 + ... + 8374743.

It is an arithmetic number, because the mean of its divisors is an integer number (1285837074834).

Almost surely, 2^{21261022320411} is an apocalyptic number.

21261022320411 is a deficient number, since it is larger than the sum of its proper divisors (9599067475605).

21261022320411 is a wasteful number, since it uses less digits than its factorization.

21261022320411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13630523 (or 13630520 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

Adding to 21261022320411 its reverse (11402322016212), we get a palindrome (32663344336623).

The spelling of 21261022320411 in words is "twenty-one trillion, two hundred sixty-one billion, twenty-two million, three hundred twenty thousand, four hundred eleven".