21212204011400 has 24 divisors (see below), whose sum is σ = 49318374326970. Its totient is φ = 8484881604480.

The previous prime is 21212204011381. The next prime is 21212204011429. The reversal of 21212204011400 is 411040221212.

It can be written as a sum of positive squares in 3 ways, for example, as 15205616715844 + 6006587295556 = 3899438^2 + 2450834^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 53030509829 + ... + 53030510228.

Almost surely, 2^{21212204011400} is an apocalyptic number.

21212204011400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21212204011400 is an abundant number, since it is smaller than the sum of its proper divisors (28106170315570).

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

21212204011400 is a wasteful number, since it uses less digits than its factorization.

21212204011400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106061020073 (or 106061020064 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21212204011400 its reverse (411040221212), we get a palindrome (21623244232612).

The spelling of 21212204011400 in words is "twenty-one trillion, two hundred twelve billion, two hundred four million, eleven thousand, four hundred".