21973051 has 2 divisors, whose sum is σ = 21973052. Its totient is φ = 21973050.

The previous prime is 21973033. The next prime is 21973069. The reversal of 21973051 is 15037912.

It is a balanced prime because it is at equal distance from previous prime (21973033) and next prime (21973069).

It is a cyclic number.

It is not a de Polignac number, because 21973051 - 2⁹ = 21972539 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21973001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10986525 + 10986526.

It is an arithmetic number, because the mean of its divisors is an integer number (10986526).

Almost surely, 2^21973051 is an apocalyptic number.

21973051 is a deficient number, since it is larger than the sum of its proper divisors (1).

21973051 is an equidigital number, since it uses as much as digits as its factorization.

21973051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1890, while the sum is 28.

The square root of 21973051 is about 4687.5421064776. The cubic root of 21973051 is about 280.0894739566.

The spelling of 21973051 in words is "twenty-one million, nine hundred seventy-three thousand, fifty-one".