621721354 has 8 divisors (see below), whose sum is σ = 933737220. Its totient is φ = 310475616.

The previous prime is 621721351. The next prime is 621721361. The reversal of 621721354 is 453127126.

It can be written as a sum of positive squares in 2 ways, for example, as 621355329 + 366025 = 24927^2 + 605^2 .

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

It is not an unprimeable number, because it can be changed into a prime (621721351) 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, 190509 + ... + 193744.

Almost surely, 2^621721354 is an apocalyptic number.

621721354 is a deficient number, since it is larger than the sum of its proper divisors (312015866).

621721354 is a wasteful number, since it uses less digits than its factorization.

621721354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385064.

The product of its digits is 10080, while the sum is 31.

The square root of 621721354 is about 24934.3408575402. The cubic root of 621721354 is about 853.4903099003.

The spelling of 621721354 in words is "six hundred twenty-one million, seven hundred twenty-one thousand, three hundred fifty-four".