1642010621 has 4 divisors (see below), whose sum is σ = 1643514012. Its totient is φ = 1640507232.

The previous prime is 1642010561. The next prime is 1642010639. The reversal of 1642010621 is 1260102461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1260102461 = 29 ⋅43451809.

It can be written as a sum of positive squares in 2 ways, for example, as 972753721 + 669256900 = 31189^2 + 25870^2 .

It is a cyclic number.

It is not a de Polignac number, because 1642010621 - 2²² = 1637816317 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 (1642013621) 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, 750056 + ... + 752241.

It is an arithmetic number, because the mean of its divisors is an integer number (410878503).

Almost surely, 2^1642010621 is an apocalyptic number.

It is an amenable number.

1642010621 is a deficient number, since it is larger than the sum of its proper divisors (1503391).

1642010621 is a wasteful number, since it uses less digits than its factorization.

1642010621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1503390.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 1642010621 is about 40521.7302320619. The cubic root of 1642010621 is about 1179.7554364844.

The spelling of 1642010621 in words is "one billion, six hundred forty-two million, ten thousand, six hundred twenty-one".