20969121 has 8 divisors (see below), whose sum is σ = 28714624. Its totient is φ = 13601520.

The previous prime is 20969119. The next prime is 20969129. The reversal of 20969121 is 12196902.

It is a happy number.

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

It is not a de Polignac number, because 20969121 - 2¹ = 20969119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20969129) 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, 94345 + ... + 94566.

It is an arithmetic number, because the mean of its divisors is an integer number (3589328).

Almost surely, 2^20969121 is an apocalyptic number.

It is an amenable number.

20969121 is a deficient number, since it is larger than the sum of its proper divisors (7745503).

20969121 is a wasteful number, since it uses less digits than its factorization.

20969121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188951.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 20969121 is about 4579.2052803953. The cubic root of 20969121 is about 275.7571246057.

The spelling of 20969121 in words is "twenty million, nine hundred sixty-nine thousand, one hundred twenty-one".