621211066 has 16 divisors (see below), whose sum is σ = 1065257280. Its totient is φ = 266152320.

The previous prime is 621211057. The next prime is 621211081. The reversal of 621211066 is 660112126.

It is a self number, because there is not a number n which added to its sum of digits gives 621211066.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75306 + ... + 83146.

It is an arithmetic number, because the mean of its divisors is an integer number (66578580).

Almost surely, 2^621211066 is an apocalyptic number.

621211066 is a deficient number, since it is larger than the sum of its proper divisors (444046214).

621211066 is a wasteful number, since it uses less digits than its factorization.

621211066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13509.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 621211066 is about 24924.1061223868. The cubic root of 621211066 is about 853.2567405959.

The spelling of 621211066 in words is "six hundred twenty-one million, two hundred eleven thousand, sixty-six".