21002121211000 has 64 divisors (see below), whose sum is σ = 50730285116160. Its totient is φ = 8129853360000.

The previous prime is 21002121210997. The next prime is 21002121211033. The reversal of 21002121211000 is 11212120012.

It is a super-2 number, since 2×21002121211000² (a number of 27 digits) contains 22 as substring.

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, 338712891 + ... + 338774890.

It is an arithmetic number, because the mean of its divisors is an integer number (792660704940).

Almost surely, 2^{21002121211000} is an apocalyptic number.

21002121211000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21002121211000 is an abundant number, since it is smaller than the sum of its proper divisors (29728163905160).

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

21002121211000 is a wasteful number, since it uses less digits than its factorization.

21002121211000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 677487833 (or 677487819 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21002121211000 its reverse (11212120012), we get a palindrome (21013333331012).

The spelling of 21002121211000 in words is "twenty-one trillion, two billion, one hundred twenty-one million, two hundred eleven thousand".