21069401783720 has 64 divisors (see below), whose sum is σ = 47840307229440. Its totient is φ = 8350772601600.

The previous prime is 21069401783719. The next prime is 21069401783743. The reversal of 21069401783720 is 2738710496012.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 422129 + ... + 6505151.

It is an arithmetic number, because the mean of its divisors is an integer number (747504800460).

Almost surely, 2^{21069401783720} is an apocalyptic number.

21069401783720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21069401783720 is an abundant number, since it is smaller than the sum of its proper divisors (26770905445720).

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

21069401783720 is a wasteful number, since it uses less digits than its factorization.

21069401783720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6083826 (or 6083822 counting only the distinct ones).

The product of its (nonzero) digits is 1016064, while the sum is 50.

The spelling of 21069401783720 in words is "twenty-one trillion, sixty-nine billion, four hundred one million, seven hundred eighty-three thousand, seven hundred twenty".