2121003400 has 24 divisors (see below), whose sum is σ = 4931333370. Its totient is φ = 848401280.

The previous prime is 2121003371. The next prime is 2121003407. The reversal of 2121003400 is 43001212.

It can be written as a sum of positive squares in 3 ways, for example, as 2067157156 + 53846244 = 45466^2 + 7338^2 .

It is not an unprimeable number, because it can be changed into a prime (2121003407) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5302309 + ... + 5302708.

Almost surely, 2^2121003400 is an apocalyptic number.

2121003400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121003400 is an abundant number, since it is smaller than the sum of its proper divisors (2810329970).

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

2121003400 is a wasteful number, since it uses less digits than its factorization.

2121003400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10605033 (or 10605024 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 2121003400 is about 46054.3526715988. The cubic root of 2121003400 is about 1284.8342986082.

Adding to 2121003400 its reverse (43001212), we get a palindrome (2164004612).

The spelling of 2121003400 in words is "two billion, one hundred twenty-one million, three thousand, four hundred".