621219921 has 8 divisors (see below), whose sum is σ = 946620864. Its totient is φ = 354982800.

The previous prime is 621219917. The next prime is 621219941. The reversal of 621219921 is 129912126.

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

It is not a de Polignac number, because 621219921 - 2² = 621219917 is a prime.

It is not an unprimeable number, because it can be changed into a prime (621219901) 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, 14790930 + ... + 14790971.

It is an arithmetic number, because the mean of its divisors is an integer number (118327608).

Almost surely, 2^621219921 is an apocalyptic number.

It is an amenable number.

621219921 is a deficient number, since it is larger than the sum of its proper divisors (325400943).

621219921 is a wasteful number, since it uses less digits than its factorization.

621219921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29581911.

The product of its digits is 3888, while the sum is 33.

The square root of 621219921 is about 24924.2837610231. The cubic root of 621219921 is about 853.2607948017.

The spelling of 621219921 in words is "six hundred twenty-one million, two hundred nineteen thousand, nine hundred twenty-one".