21000211002100 has 36 divisors (see below), whose sum is σ = 49713226774848. Its totient is φ = 7636440364000.

The previous prime is 21000211002091. The next prime is 21000211002119. The reversal of 21000211002100 is 120011200012.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9545549356 + ... + 9545551555.

It is an arithmetic number, because the mean of its divisors is an integer number (1380922965968).

Almost surely, 2^{21000211002100} is an apocalyptic number.

21000211002100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21000211002100 is an abundant number, since it is smaller than the sum of its proper divisors (28713015772748).

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

21000211002100 is a wasteful number, since it uses less digits than its factorization.

21000211002100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19091100936 (or 19091100929 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21000211002100 its reverse (120011200012), we get a palindrome (21120222202112).

The spelling of 21000211002100 in words is "twenty-one trillion, two hundred eleven million, two thousand, one hundred".