1621032426432 has 224 divisors, whose sum is σ = 5072725440000. Its totient is φ = 506152323072.

The previous prime is 1621032426397. The next prime is 1621032426443. The reversal of 1621032426432 is 2346242301261.

1621032426432 is a `hidden beast` number, since 1 + 6 + 2 + 1 + 0 + 3 + 2 + 4 + 2 + 643 + 2 = 666.

It is a super-2 number, since 2×1621032426432² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

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 31 ways as a sum of consecutive naturals, for example, 2644669 + ... + 3199427.

Almost surely, 2^{1621032426432} is an apocalyptic number.

1621032426432 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1621032426432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2536362720000).

1621032426432 is an abundant number, since it is smaller than the sum of its proper divisors (3451693013568).

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

1621032426432 is a wasteful number, since it uses less digits than its factorization.

1621032426432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 554888 (or 554872 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 36.

Adding to 1621032426432 its reverse (2346242301261), we get a palindrome (3967274727693).

The spelling of 1621032426432 in words is "one trillion, six hundred twenty-one billion, thirty-two million, four hundred twenty-six thousand, four hundred thirty-two".