21034121 has 16 divisors (see below), whose sum is σ = 23347200. Its totient is φ = 18860688.

The previous prime is 21034067. The next prime is 21034129. The reversal of 21034121 is 12143012.

It is a cyclic number.

It is not a de Polignac number, because 21034121 - 2²² = 16839817 is a prime.

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

It is a junction number, because it is equal to n+sod(n) for n = 21034096 and 21034105.

It is not an unprimeable number, because it can be changed into a prime (21034129) 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, 55310 + ... + 55688.

It is an arithmetic number, because the mean of its divisors is an integer number (1459200).

Almost surely, 2^21034121 is an apocalyptic number.

It is an amenable number.

21034121 is a deficient number, since it is larger than the sum of its proper divisors (2313079).

21034121 is a wasteful number, since it uses less digits than its factorization.

21034121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 548.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 21034121 is about 4586.2970902461. The cubic root of 21034121 is about 276.0417609917.

Adding to 21034121 its reverse (12143012), we get a palindrome (33177133).

The spelling of 21034121 in words is "twenty-one million, thirty-four thousand, one hundred twenty-one".