21021552401450 has 24 divisors (see below), whose sum is σ = 39339965319168. Its totient is φ = 8357034325680.

The previous prime is 21021552401441. The next prime is 21021552401459. The reversal of 21021552401450 is 5410425512012.

It is an interprime number because it is at equal distance from previous prime (21021552401441) and next prime (21021552401459).

It is not an unprimeable number, because it can be changed into a prime (21021552401459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1289657642 + ... + 1289673941.

It is an arithmetic number, because the mean of its divisors is an integer number (1639165221632).

Almost surely, 2^{21021552401450} is an apocalyptic number.

21021552401450 is a deficient number, since it is larger than the sum of its proper divisors (18318412917718).

21021552401450 is a wasteful number, since it uses less digits than its factorization.

21021552401450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2579331758 (or 2579331753 counting only the distinct ones).

The product of its (nonzero) digits is 16000, while the sum is 32.

Adding to 21021552401450 its reverse (5410425512012), we get a palindrome (26431977913462).

The spelling of 21021552401450 in words is "twenty-one trillion, twenty-one billion, five hundred fifty-two million, four hundred one thousand, four hundred fifty".