2071621 has 4 divisors (see below), whose sum is σ = 2105644. Its totient is φ = 2037600.

The previous prime is 2071613. The next prime is 2071631. The reversal of 2071621 is 1261702.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 83521 + 1988100 = 289^2 + 1410^2 .

It is a cyclic number.

It is not a de Polignac number, because 2071621 - 2³ = 2071613 is a prime.

It is a super-2 number, since 2×2071621² = 8583227135282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2071631) 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, 16920 + ... + 17041.

It is an arithmetic number, because the mean of its divisors is an integer number (526411).

2^2071621 is an apocalyptic number.

It is an amenable number.

2071621 is a deficient number, since it is larger than the sum of its proper divisors (34023).

2071621 is an equidigital number, since it uses as much as digits as its factorization.

2071621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34022.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 2071621 is about 1439.3126831929. The cubic root of 2071621 is about 127.4784482347.

The spelling of 2071621 in words is "two million, seventy-one thousand, six hundred twenty-one".