621533425450042 has 16 divisors (see below), whose sum is σ = 1065676785409152. Its totient is φ = 266323739747760.

The previous prime is 621533425450039. The next prime is 621533425450129. The reversal of 621533425450042 is 240054524335126.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 621533425449974 and 621533425450001.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3977277598 + ... + 3977433865.

It is an arithmetic number, because the mean of its divisors is an integer number (66604799088072).

Almost surely, 2^{621533425450042} is an apocalyptic number.

621533425450042 is a deficient number, since it is larger than the sum of its proper divisors (444143359959110).

621533425450042 is a wasteful number, since it uses less digits than its factorization.

621533425450042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7954717053.

The product of its (nonzero) digits is 3456000, while the sum is 46.

Adding to 621533425450042 its reverse (240054524335126), we get a palindrome (861587949785168).

The spelling of 621533425450042 in words is "six hundred twenty-one trillion, five hundred thirty-three billion, four hundred twenty-five million, four hundred fifty thousand, forty-two".