21212131101030 has 96 divisors (see below), whose sum is σ = 57553632774144. Its totient is φ = 5410235780928.

The previous prime is 21212131101017. The next prime is 21212131101037. The reversal of 21212131101030 is 3010113121212.

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 = 21212131100994 and 21212131101012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212131101037) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 28544847 + ... + 29278533.

It is an arithmetic number, because the mean of its divisors is an integer number (599517008064).

Almost surely, 2^{21212131101030} is an apocalyptic number.

21212131101030 is an abundant number, since it is smaller than the sum of its proper divisors (36341501673114).

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

21212131101030 is a wasteful number, since it uses less digits than its factorization.

21212131101030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 747690 (or 747687 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 21212131101030 its reverse (3010113121212), we get a palindrome (24222244222242).

The spelling of 21212131101030 in words is "twenty-one trillion, two hundred twelve billion, one hundred thirty-one million, one hundred one thousand, thirty".