21210001121100 has 144 divisors (see below), whose sum is σ = 67609313726976. Its totient is φ = 5090909280000.

The previous prime is 21210001121021. The next prime is 21210001121117. The reversal of 21210001121100 is 112110001212.

21210001121100 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 31484884 + ... + 32151483.

It is an arithmetic number, because the mean of its divisors is an integer number (469509123104).

Almost surely, 2^{21210001121100} is an apocalyptic number.

21210001121100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21210001121100 is an abundant number, since it is smaller than the sum of its proper divisors (46399312605876).

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

21210001121100 is a wasteful number, since it uses less digits than its factorization.

21210001121100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63636496 (or 63636489 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21210001121100 its reverse (112110001212), we get a palindrome (21322111122312).

It can be divided in two parts, 2121000112 and 1100, that added together give a palindrome (2121001212).

The spelling of 21210001121100 in words is "twenty-one trillion, two hundred ten billion, one million, one hundred twenty-one thousand, one hundred".