21212131030 has 16 divisors (see below), whose sum is σ = 38184250464. Its totient is φ = 8484315840.

The previous prime is 21212131019. The next prime is 21212131049. The reversal of 21212131030 is 3013121212.

It is a junction number, because it is equal to n+sod(n) for n = 21212130995 and 21212131013.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 125215 + ... + 241045.

It is an arithmetic number, because the mean of its divisors is an integer number (2386515654).

Almost surely, 2^21212131030 is an apocalyptic number.

21212131030 is a deficient number, since it is larger than the sum of its proper divisors (16972119434).

21212131030 is a wasteful number, since it uses less digits than its factorization.

21212131030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134151.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21212131030 its reverse (3013121212), we get a palindrome (24225252242).

The spelling of 21212131030 in words is "twenty-one billion, two hundred twelve million, one hundred thirty-one thousand, thirty".