1621212066 has 12 divisors (see below), whose sum is σ = 3512626182. Its totient is φ = 540404016.

The previous prime is 1621212059. The next prime is 1621212077. The reversal of 1621212066 is 6602121261.

It can be written as a sum of positive squares in only one way, i.e., 1058526225 + 562685841 = 32535^2 + 23721^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 45033651 + ... + 45033686.

Almost surely, 2^1621212066 is an apocalyptic number.

1621212066 is an abundant number, since it is smaller than the sum of its proper divisors (1891414116).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1621212066 is a wasteful number, since it uses less digits than its factorization.

1621212066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90067345 (or 90067342 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 1621212066 is about 40264.2777906173. The cubic root of 1621212066 is about 1174.7531253784.

The spelling of 1621212066 in words is "one billion, six hundred twenty-one million, two hundred twelve thousand, sixty-six".