21939130507454 has 16 divisors (see below), whose sum is σ = 32922507128976. Its totient is φ = 10964962008000.

The previous prime is 21939130507439. The next prime is 21939130507457. The reversal of 21939130507454 is 45470503193912.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21939130507396 and 21939130507405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21939130507457) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86315354 + ... + 86569154.

It is an arithmetic number, because the mean of its divisors is an integer number (2057656695561).

Almost surely, 2^{21939130507454} is an apocalyptic number.

21939130507454 is a deficient number, since it is larger than the sum of its proper divisors (10983376621522).

21939130507454 is a wasteful number, since it uses less digits than its factorization.

21939130507454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271771.

The product of its (nonzero) digits is 4082400, while the sum is 53.

The spelling of 21939130507454 in words is "twenty-one trillion, nine hundred thirty-nine billion, one hundred thirty million, five hundred seven thousand, four hundred fifty-four".