21185386722040 has 32 divisors (see below), whose sum is σ = 47667918624480. Its totient is φ = 8474012733312.

The previous prime is 21185386722037. The next prime is 21185386722089. The reversal of 21185386722040 is 4022768358112.

It is a super-2 number, since 2×21185386722040² (a number of 27 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 2001939 + ... + 6810178.

It is an arithmetic number, because the mean of its divisors is an integer number (1489622457015).

Almost surely, 2^{21185386722040} is an apocalyptic number.

21185386722040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21185386722040 is an abundant number, since it is smaller than the sum of its proper divisors (26482531902440).

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

21185386722040 is a wasteful number, since it uses less digits than its factorization.

21185386722040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8872231 (or 8872227 counting only the distinct ones).

The product of its (nonzero) digits is 1290240, while the sum is 49.

The spelling of 21185386722040 in words is "twenty-one trillion, one hundred eighty-five billion, three hundred eighty-six million, seven hundred twenty-two thousand, forty".