2021551 has 8 divisors (see below), whose sum is σ = 2332800. Its totient is φ = 1715928.

The previous prime is 2021549. The next prime is 2021563. The reversal of 2021551 is 1551202.

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

It is a cyclic number.

It is not a de Polignac number, because 2021551 - 2¹ = 2021549 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 (2021501) 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, 601 + ... + 2098.

It is an arithmetic number, because the mean of its divisors is an integer number (291600).

2^2021551 is an apocalyptic number.

2021551 is a deficient number, since it is larger than the sum of its proper divisors (311249).

2021551 is a wasteful number, since it uses less digits than its factorization.

2021551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2813.

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 2021551 is about 1421.8125755528. The cubic root of 2021551 is about 126.4430318354.

Adding to 2021551 its reverse (1551202), we get a palindrome (3572753).

The spelling of 2021551 in words is "two million, twenty-one thousand, five hundred fifty-one".