21011221330404 has 12 divisors (see below), whose sum is σ = 49026183104304. Its totient is φ = 7003740443464.

The previous prime is 21011221330399. The next prime is 21011221330423. The reversal of 21011221330404 is 40403312211012.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-3 number, since 3×21011221330404³ (a number of 41 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 875467555422 + ... + 875467555445.

It is an arithmetic number, because the mean of its divisors is an integer number (4085515258692).

Almost surely, 2^{21011221330404} is an apocalyptic number.

It is an amenable number.

21011221330404 is an abundant number, since it is smaller than the sum of its proper divisors (28014961773900).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21011221330404 is a wasteful number, since it uses less digits than its factorization.

21011221330404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1750935110874 (or 1750935110872 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 21011221330404 its reverse (40403312211012), we get a palindrome (61414533541416).

The spelling of 21011221330404 in words is "twenty-one trillion, eleven billion, two hundred twenty-one million, three hundred thirty thousand, four hundred four".