621420331 has 8 divisors (see below), whose sum is σ = 711249120. Its totient is φ = 531855168.

The previous prime is 621420281. The next prime is 621420361. The reversal of 621420331 is 133024126.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 621420331 - 2¹⁵ = 621387563 is a prime.

It is a super-2 number, since 2×621420331² = 772326455560299122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (621420361) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60826 + ... + 70303.

It is an arithmetic number, because the mean of its divisors is an integer number (88906140).

Almost surely, 2^621420331 is an apocalyptic number.

621420331 is a deficient number, since it is larger than the sum of its proper divisors (89828789).

621420331 is a wasteful number, since it uses less digits than its factorization.

621420331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131813.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 621420331 is about 24928.3038131358. The cubic root of 621420331 is about 853.3525409529.

Adding to 621420331 its reverse (133024126), we get a palindrome (754444457).

The spelling of 621420331 in words is "six hundred twenty-one million, four hundred twenty thousand, three hundred thirty-one".