21043551341254 has 16 divisors (see below), whose sum is σ = 34006538889792. Its totient is φ = 9708662654208.

The previous prime is 21043551341249. The next prime is 21043551341363. The reversal of 21043551341254 is 45214315534012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 156000334 + ... + 156135169.

It is an arithmetic number, because the mean of its divisors is an integer number (2125408680612).

Almost surely, 2^{21043551341254} is an apocalyptic number.

21043551341254 is a deficient number, since it is larger than the sum of its proper divisors (12962987548538).

21043551341254 is a wasteful number, since it uses less digits than its factorization.

21043551341254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312138111.

The product of its (nonzero) digits is 288000, while the sum is 40.

Adding to 21043551341254 its reverse (45214315534012), we get a palindrome (66257866875266).

The spelling of 21043551341254 in words is "twenty-one trillion, forty-three billion, five hundred fifty-one million, three hundred forty-one thousand, two hundred fifty-four".