21131220031030 has 8 divisors (see below), whose sum is σ = 38036196055872. Its totient is φ = 8452488012408.

The previous prime is 21131220031027. The next prime is 21131220031037. The reversal of 21131220031030 is 3013002213112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21131220030989 and 21131220031007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21131220031037) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1056561001542 + ... + 1056561001561.

It is an arithmetic number, because the mean of its divisors is an integer number (4754524506984).

Almost surely, 2^{21131220031030} is an apocalyptic number.

21131220031030 is a deficient number, since it is larger than the sum of its proper divisors (16904976024842).

21131220031030 is a wasteful number, since it uses less digits than its factorization.

21131220031030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2113122003110.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21131220031030 its reverse (3013002213112), we get a palindrome (24144222244142).

The spelling of 21131220031030 in words is "twenty-one trillion, one hundred thirty-one billion, two hundred twenty million, thirty-one thousand, thirty".