21981432126096 has 45 divisors (see below), whose sum is σ = 61517637639939. Its totient is φ = 7327125288288.

The previous prime is 21981432126019. The next prime is 21981432126119. The reversal of 21981432126096 is 69062123418912.

It is a happy number.

The square root of 21981432126096 is 4688436.

It is a perfect power (a square), and thus also a powerful number.

21981432126096 is a `hidden beast` number, since 2 + 1 + 9 + 8 + 1 + 4 + 3 + 21 + 2 + 609 + 6 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 56065881 + ... + 56456583.

Almost surely, 2^{21981432126096} is an apocalyptic number.

21981432126096 is the 4688436-th square number.

It is an amenable number.

21981432126096 is an abundant number, since it is smaller than the sum of its proper divisors (39536205513843).

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

21981432126096 is an frugal number, since it uses more digits than its factorization.

21981432126096 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 781420 (or 390708 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 54.

The spelling of 21981432126096 in words is "twenty-one trillion, nine hundred eighty-one billion, four hundred thirty-two million, one hundred twenty-six thousand, ninety-six".