421971523899840 has 168 divisors, whose sum is σ = 1459005208098048. Its totient is φ = 111936599562240.

The previous prime is 421971523899823. The next prime is 421971523899859. The reversal of 421971523899840 is 48998325179124.

It is a happy number.

421971523899840 is a `hidden beast` number, since 4 + 2 + 1 + 9 + 7 + 1 + 523 + 8 + 9 + 98 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 383004607 + ... + 384104766.

Almost surely, 2^{421971523899840} is an apocalyptic number.

421971523899840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

421971523899840 is an abundant number, since it is smaller than the sum of its proper divisors (1037033684198208).

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

421971523899840 is a wasteful number, since it uses less digits than its factorization.

421971523899840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 767109587 (or 767109574 counting only the distinct ones).

The product of its (nonzero) digits is 313528320, while the sum is 72.

The spelling of 421971523899840 in words is "four hundred twenty-one trillion, nine hundred seventy-one billion, five hundred twenty-three million, eight hundred ninety-nine thousand, eight hundred forty".