2181021401450 has 24 divisors (see below), whose sum is σ = 4057392503340. Its totient is φ = 872259593600.

The previous prime is 2181021401413. The next prime is 2181021401453. The reversal of 2181021401450 is 541041201812.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 230689050601 + 1950332350849 = 480301^2 + 1396543^2 .

It is not an unprimeable number, because it can be changed into a prime (2181021401453) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3428195 + ... + 4014294.

Almost surely, 2^{2181021401450} is an apocalyptic number.

2181021401450 is a deficient number, since it is larger than the sum of its proper divisors (1876371101890).

2181021401450 is a wasteful number, since it uses less digits than its factorization.

2181021401450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7448362 (or 7448357 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 29.

The spelling of 2181021401450 in words is "two trillion, one hundred eighty-one billion, twenty-one million, four hundred one thousand, four hundred fifty".