20962121 has 4 divisors (see below), whose sum is σ = 21039744. Its totient is φ = 20884500.

The previous prime is 20962079. The next prime is 20962129. The reversal of 20962121 is 12126902.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20962121 is a prime.

It is a Duffinian number.

It is a zygodrome in base 8.

It is not an unprimeable number, because it can be changed into a prime (20962129) 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, 38405 + ... + 38946.

It is an arithmetic number, because the mean of its divisors is an integer number (5259936).

Almost surely, 2^20962121 is an apocalyptic number.

It is an amenable number.

20962121 is a deficient number, since it is larger than the sum of its proper divisors (77623).

20962121 is an equidigital number, since it uses as much as digits as its factorization.

20962121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77622.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 20962121 is about 4578.4408918321. The cubic root of 20962121 is about 275.7264363903.

The spelling of 20962121 in words is "twenty million, nine hundred sixty-two thousand, one hundred twenty-one".