21196751 has 2 divisors, whose sum is σ = 21196752. Its totient is φ = 21196750.

The previous prime is 21196733. The next prime is 21196759. The reversal of 21196751 is 15769112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21196751 - 2⁶ = 21196687 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21196759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10598375 + 10598376.

It is an arithmetic number, because the mean of its divisors is an integer number (10598376).

Almost surely, 2^21196751 is an apocalyptic number.

21196751 is a deficient number, since it is larger than the sum of its proper divisors (1).

21196751 is an equidigital number, since it uses as much as digits as its factorization.

21196751 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3780, while the sum is 32.

The square root of 21196751 is about 4603.9929409155. The cubic root of 21196751 is about 276.7513614671.

The spelling of 21196751 in words is "twenty-one million, one hundred ninety-six thousand, seven hundred fifty-one".