21151103535444 has 24 divisors (see below), whose sum is σ = 49356800273088. Its totient is φ = 7049764222720.

The previous prime is 21151103535421. The next prime is 21151103535449. The reversal of 21151103535444 is 44453530115112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21151103535449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75306792 + ... + 75587135.

It is an arithmetic number, because the mean of its divisors is an integer number (2056533344712).

Almost surely, 2^{21151103535444} is an apocalyptic number.

It is an amenable number.

21151103535444 is an abundant number, since it is smaller than the sum of its proper divisors (28205696737644).

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

21151103535444 is a wasteful number, since it uses less digits than its factorization.

21151103535444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150905615 (or 150905613 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 39.

The spelling of 21151103535444 in words is "twenty-one trillion, one hundred fifty-one billion, one hundred three million, five hundred thirty-five thousand, four hundred forty-four".