21474042778440 has 160 divisors (see below), whose sum is σ = 82487592982080. Its totient is φ = 4908352629888.

The previous prime is 21474042778423. The next prime is 21474042778567. The reversal of 21474042778440 is 4487724047412.

21474042778440 is a `hidden beast` number, since 2 + 147 + 4 + 0 + 427 + 78 + 4 + 4 + 0 = 666.

It is a super-2 number, since 2×21474042778440² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 473390962 + ... + 473436321.

It is an arithmetic number, because the mean of its divisors is an integer number (515547456138).

Almost surely, 2^{21474042778440} is an apocalyptic number.

21474042778440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21474042778440 is an abundant number, since it is smaller than the sum of its proper divisors (61013550203640).

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

21474042778440 is a wasteful number, since it uses less digits than its factorization.

21474042778440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 946827313 (or 946827300 counting only the distinct ones).

The product of its (nonzero) digits is 11239424, while the sum is 54.

The spelling of 21474042778440 in words is "twenty-one trillion, four hundred seventy-four billion, forty-two million, seven hundred seventy-eight thousand, four hundred forty".