21437337113478 has 144 divisors (see below), whose sum is σ = 55000309684320. Its totient is φ = 5994369342720.

The previous prime is 21437337113473. The next prime is 21437337113531. The reversal of 21437337113478 is 87431173373412.

21437337113478 is a `hidden beast` number, since 2 + 1 + 4 + 3 + 73 + 371 + 134 + 78 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21437337113473) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 82065138 + ... + 82325946.

It is an arithmetic number, because the mean of its divisors is an integer number (381946595030).

Almost surely, 2^{21437337113478} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21437337113478, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27500154842160).

21437337113478 is an abundant number, since it is smaller than the sum of its proper divisors (33562972570842).

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

21437337113478 is a wasteful number, since it uses less digits than its factorization.

21437337113478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263755 (or 263741 counting only the distinct ones).

The product of its digits is 7112448, while the sum is 54.

The spelling of 21437337113478 in words is "twenty-one trillion, four hundred thirty-seven billion, three hundred thirty-seven million, one hundred thirteen thousand, four hundred seventy-eight".