21212131002 has 16 divisors (see below), whose sum is σ = 42669491040. Its totient is φ = 7029838832.

The previous prime is 21212130983. The next prime is 21212131019. The reversal of 21212131002 is 20013121212.

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, 10216752 + ... + 10218827.

It is an arithmetic number, because the mean of its divisors is an integer number (2666843190).

Almost surely, 2^21212131002 is an apocalyptic number.

21212131002 is an abundant number, since it is smaller than the sum of its proper divisors (21457360038).

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

21212131002 is a wasteful number, since it uses less digits than its factorization.

21212131002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20435757.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21212131002 its reverse (20013121212), we get a palindrome (41225252214).

The spelling of 21212131002 in words is "twenty-one billion, two hundred twelve million, one hundred thirty-one thousand, two".