621227021 has 8 divisors (see below), whose sum is σ = 658917600. Its totient is φ = 584035920.

The previous prime is 621227017. The next prime is 621227027. The reversal of 621227021 is 120722126.

It is a happy number.

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 621227021 - 2² = 621227017 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 (621227027) 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, 122306 + ... + 127283.

It is an arithmetic number, because the mean of its divisors is an integer number (82364700).

Almost surely, 2^621227021 is an apocalyptic number.

It is an amenable number.

621227021 is a deficient number, since it is larger than the sum of its proper divisors (37690579).

621227021 is a wasteful number, since it uses less digits than its factorization.

621227021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249739.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 621227021 is about 24924.4261919909. The cubic root of 621227021 is about 853.2640454640.

Adding to 621227021 its reverse (120722126), we get a palindrome (741949147).

It can be divided in two parts, 6212 and 27021, that added together give a palindrome (33233).

The spelling of 621227021 in words is "six hundred twenty-one million, two hundred twenty-seven thousand, twenty-one".