21212131000 has 32 divisors (see below), whose sum is σ = 49636388880. Its totient is φ = 8484852000.

The previous prime is 21212130983. The next prime is 21212131019. The reversal of 21212131000 is 13121212.

It is a super-2 number, since 2×21212131000² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10605066 + ... + 10607065.

Almost surely, 2^21212131000 is an apocalyptic number.

21212131000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21212131000 is an abundant number, since it is smaller than the sum of its proper divisors (28424257880).

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

21212131000 is a wasteful number, since it uses less digits than its factorization.

21212131000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21212152 (or 21212138 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21212131000 its reverse (13121212), we get a palindrome (21225252212).

The spelling of 21212131000 in words is "twenty-one billion, two hundred twelve million, one hundred thirty-one thousand".