400021400033340 has 96 divisors (see below), whose sum is σ = 1167140214434880. Its totient is φ = 102242234443776.

The previous prime is 400021400033279. The next prime is 400021400033377. The reversal of 400021400033340 is 43330004120004.

It is a super-2 number, since 2×400021400033340² (a number of 30 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 400021400033340.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 838803067 + ... + 839279826.

It is an arithmetic number, because the mean of its divisors is an integer number (12157710567030).

Almost surely, 2^{400021400033340} is an apocalyptic number.

It is an amenable number.

400021400033340 is an abundant number, since it is smaller than the sum of its proper divisors (767118814401540).

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

400021400033340 is a wasteful number, since it uses less digits than its factorization.

400021400033340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1678083071 (or 1678083069 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 24.

Adding to 400021400033340 its reverse (43330004120004), we get a palindrome (443351404153344).

The spelling of 400021400033340 in words is "four hundred trillion, twenty-one billion, four hundred million, thirty-three thousand, three hundred forty".