621520042 has 32 divisors (see below), whose sum is σ = 1113860160. Its totient is φ = 256350720.

The previous prime is 621520021. The next prime is 621520063. The reversal of 621520042 is 240025126.

It is an interprime number because it is at equal distance from previous prime (621520021) and next prime (621520063).

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 621519995 and 621520022.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1543 + ... + 35290.

It is an arithmetic number, because the mean of its divisors is an integer number (34808130).

Almost surely, 2^621520042 is an apocalyptic number.

621520042 is a deficient number, since it is larger than the sum of its proper divisors (492340118).

621520042 is a wasteful number, since it uses less digits than its factorization.

621520042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36918.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 621520042 is about 24930.3036884832. The cubic root of 621520042 is about 853.3981805307.

Adding to 621520042 its reverse (240025126), we get a palindrome (861545168).

The spelling of 621520042 in words is "six hundred twenty-one million, five hundred twenty thousand, forty-two".