621142621 has 4 divisors (see below), whose sum is σ = 677610144. Its totient is φ = 564675100.

The previous prime is 621142541. The next prime is 621142631. The reversal of 621142621 is 126241126.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 621142621 - 2¹⁷ = 621011549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621142631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28233745 + ... + 28233766.

It is an arithmetic number, because the mean of its divisors is an integer number (169402536).

Almost surely, 2^621142621 is an apocalyptic number.

It is an amenable number.

621142621 is a deficient number, since it is larger than the sum of its proper divisors (56467523).

621142621 is a wasteful number, since it uses less digits than its factorization.

621142621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56467522.

The product of its digits is 1152, while the sum is 25.

The square root of 621142621 is about 24922.7330162645. The cubic root of 621142621 is about 853.2254021852.

Adding to 621142621 its reverse (126241126), we get a palindrome (747383747).

The spelling of 621142621 in words is "six hundred twenty-one million, one hundred forty-two thousand, six hundred twenty-one".