21076121 has 8 divisors (see below), whose sum is σ = 23025600. Its totient is φ = 19132240.

The previous prime is 21076093. The next prime is 21076129. The reversal of 21076121 is 12167012.

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 21076121 - 2⁶ = 21076057 is a prime.

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

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21076093 and 21076102.

It is not an unprimeable number, because it can be changed into a prime (21076129) 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, 12740 + ... + 14298.

It is an arithmetic number, because the mean of its divisors is an integer number (2878200).

Almost surely, 2^21076121 is an apocalyptic number.

It is an amenable number.

21076121 is a deficient number, since it is larger than the sum of its proper divisors (1949479).

21076121 is a wasteful number, since it uses less digits than its factorization.

21076121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2799.

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 21076121 is about 4590.8736641297. The cubic root of 21076121 is about 276.2253681552.

It can be divided in two parts, 2107 and 6121, that added together give a palindrome (8228).

The spelling of 21076121 in words is "twenty-one million, seventy-six thousand, one hundred twenty-one".