21011111103400 has 48 divisors (see below), whose sum is σ = 53291818167840. Its totient is φ = 7640404036800.

The previous prime is 21011111103397. The next prime is 21011111103403. The reversal of 21011111103400 is 430111111012.

It is an interprime number because it is at equal distance from previous prime (21011111103397) and next prime (21011111103403).

It is not an unprimeable number, because it can be changed into a prime (21011111103403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4775250324 + ... + 4775254723.

It is an arithmetic number, because the mean of its divisors is an integer number (1110246211830).

Almost surely, 2^{21011111103400} is an apocalyptic number.

21011111103400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21011111103400 is an abundant number, since it is smaller than the sum of its proper divisors (32280707064440).

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

21011111103400 is a wasteful number, since it uses less digits than its factorization.

21011111103400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9550505074 (or 9550505065 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 21011111103400 its reverse (430111111012), we get a palindrome (21441222214412).

The spelling of 21011111103400 in words is "twenty-one trillion, eleven billion, one hundred eleven million, one hundred three thousand, four hundred".