21011230013220 has 144 divisors (see below), whose sum is σ = 67485289133808. Its totient is φ = 5273237790720.

The previous prime is 21011230013197. The next prime is 21011230013239. The reversal of 21011230013220 is 2231003211012.

21011230013220 is a `hidden beast` number, since 21 + 0 + 112 + 300 + 13 + 220 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 61440528384 + 20949789484836 = 247872^2 + 4577094^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21011230013193 and 21011230013202.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 115139250 + ... + 115321590.

It is an arithmetic number, because the mean of its divisors is an integer number (468647841207).

Almost surely, 2^{21011230013220} is an apocalyptic number.

21011230013220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21011230013220 is an abundant number, since it is smaller than the sum of its proper divisors (46474059120588).

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

21011230013220 is a wasteful number, since it uses less digits than its factorization.

21011230013220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220030 (or 220025 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21011230013220 its reverse (2231003211012), we get a palindrome (23242233224232).

The spelling of 21011230013220 in words is "twenty-one trillion, eleven billion, two hundred thirty million, thirteen thousand, two hundred twenty".