21111212120000 has 70 divisors (see below), whose sum is σ = 52348945012848. Its totient is φ = 8444484832000.

The previous prime is 21111212119961. The next prime is 21111212120039. The reversal of 21111212120000 is 2121211112.

It is an interprime number because it is at equal distance from previous prime (21111212119961) and next prime (21111212120039).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 263850152 + ... + 263930151.

Almost surely, 2^{21111212120000} is an apocalyptic number.

21111212120000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21111212120000 is an abundant number, since it is smaller than the sum of its proper divisors (31237732892848).

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

21111212120000 is an frugal number, since it uses more digits than its factorization.

21111212120000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 527780335 (or 527780310 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21111212120000 its reverse (2121211112), we get a palindrome (21113333331112).

The spelling of 21111212120000 in words is "twenty-one trillion, one hundred eleven billion, two hundred twelve million, one hundred twenty thousand".