21231021311030 has 16 divisors (see below), whose sum is σ = 38786224008240. Its totient is φ = 8365656158112.

The previous prime is 21231021311009. The next prime is 21231021311033. The reversal of 21231021311030 is 3011312013212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21231021310993 and 21231021311011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21231021311033) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15844045085 + ... + 15844046424.

It is an arithmetic number, because the mean of its divisors is an integer number (2424139000515).

Almost surely, 2^{21231021311030} is an apocalyptic number.

21231021311030 is a deficient number, since it is larger than the sum of its proper divisors (17555202697210).

21231021311030 is a wasteful number, since it uses less digits than its factorization.

21231021311030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31688091583.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 21231021311030 its reverse (3011312013212), we get a palindrome (24242333324242).

The spelling of 21231021311030 in words is "twenty-one trillion, two hundred thirty-one billion, twenty-one million, three hundred eleven thousand, thirty".