21111212011000 has 64 divisors (see below), whose sum is σ = 49413607008480. Its totient is φ = 8442199180800.

The previous prime is 21111212010979. The next prime is 21111212011049. The reversal of 21111212011000 is 11021211112.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 841819 + ... + 6552181.

Almost surely, 2^{21111212011000} is an apocalyptic number.

21111212011000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21111212011000 is an abundant number, since it is smaller than the sum of its proper divisors (28302394997480).

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

21111212011000 is a wasteful number, since it uses less digits than its factorization.

21111212011000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5714081 (or 5714067 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21111212011000 its reverse (11021211112), we get a palindrome (21122233222112).

The spelling of 21111212011000 in words is "twenty-one trillion, one hundred eleven billion, two hundred twelve million, eleven thousand".