2455021 has 4 divisors (see below), whose sum is σ = 2599452. Its totient is φ = 2310592.

The previous prime is 2455003. The next prime is 2455087. The reversal of 2455021 is 1205542.

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 864900 + 1590121 = 930^2 + 1261^2 .

It is a cyclic number.

It is not a de Polignac number, because 2455021 - 2¹⁷ = 2323949 is a prime.

It is a super-2 number, since 2×2455021² = 12054256220882, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2455021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2455001) 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, 72190 + ... + 72223.

It is an arithmetic number, because the mean of its divisors is an integer number (649863).

2^2455021 is an apocalyptic number.

It is an amenable number.

2455021 is a deficient number, since it is larger than the sum of its proper divisors (144431).

2455021 is a wasteful number, since it uses less digits than its factorization.

2455021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144430.

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 2455021 is about 1566.8506629542. The cubic root of 2455021 is about 134.9020047865.

The spelling of 2455021 in words is "two million, four hundred fifty-five thousand, twenty-one".