2121654 has 32 divisors (see below), whose sum is σ = 4596480. Its totient is φ = 650592.

The previous prime is 2121653. The next prime is 2121661. The reversal of 2121654 is 4561212.

It is an alternating number because its digits alternate between even and odd.

It is a self number, because there is not a number n which added to its sum of digits gives 2121654.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121653) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3967 + ... + 4469.

It is an arithmetic number, because the mean of its divisors is an integer number (143640).

2^2121654 is an apocalyptic number.

2121654 is an abundant number, since it is smaller than the sum of its proper divisors (2474826).

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

2121654 is a wasteful number, since it uses less digits than its factorization.

2121654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 564.

The product of its digits is 480, while the sum is 21.

The square root of 2121654 is about 1456.5898530472. The cubic root of 2121654 is about 128.4965655892.

Adding to 2121654 its reverse (4561212), we get a palindrome (6682866).

It can be divided in two parts, 2121 and 654, that added together give a triangular number (2775 = T₇₄).

The spelling of 2121654 in words is "two million, one hundred twenty-one thousand, six hundred fifty-four".