21204142244144 has 10 divisors (see below), whose sum is σ = 41083025598060. Its totient is φ = 10602071122064.

The previous prime is 21204142244137. The next prime is 21204142244179. The reversal of 21204142244144 is 44144224140212.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 662629445114 + ... + 662629445145.

It is an arithmetic number, because the mean of its divisors is an integer number (4108302559806).

Almost surely, 2^{21204142244144} is an apocalyptic number.

It is an amenable number.

21204142244144 is a deficient number, since it is larger than the sum of its proper divisors (19878883353916).

21204142244144 is a wasteful number, since it uses less digits than its factorization.

21204142244144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1325258890267 (or 1325258890261 counting only the distinct ones).

The product of its (nonzero) digits is 65536, while the sum is 35.

Adding to 21204142244144 its reverse (44144224140212), we get a palindrome (65348366384356).

The spelling of 21204142244144 in words is "twenty-one trillion, two hundred four billion, one hundred forty-two million, two hundred forty-four thousand, one hundred forty-four".