21131203221030 has 32 divisors (see below), whose sum is σ = 57959871692544. Its totient is φ = 4829989307616.

The previous prime is 21131203220993. The next prime is 21131203221047. The reversal of 21131203221030 is 3012230213112.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 21131203220988 and 21131203221006.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50312388412 + ... + 50312388831.

It is an arithmetic number, because the mean of its divisors is an integer number (1811245990392).

Almost surely, 2^{21131203221030} is an apocalyptic number.

21131203221030 is an abundant number, since it is smaller than the sum of its proper divisors (36828668471514).

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

21131203221030 is a wasteful number, since it uses less digits than its factorization.

21131203221030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100624777260.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 21131203221030 its reverse (3012230213112), we get a palindrome (24143433434142).

The spelling of 21131203221030 in words is "twenty-one trillion, one hundred thirty-one billion, two hundred three million, two hundred twenty-one thousand, thirty".