21140351 has 2 divisors, whose sum is σ = 21140352. Its totient is φ = 21140350.

The previous prime is 21140341. The next prime is 21140377. The reversal of 21140351 is 15304112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21140351 - 2²² = 16946047 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 (21140341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10570175 + 10570176.

It is an arithmetic number, because the mean of its divisors is an integer number (10570176).

Almost surely, 2^21140351 is an apocalyptic number.

21140351 is a deficient number, since it is larger than the sum of its proper divisors (1).

21140351 is an equidigital number, since it uses as much as digits as its factorization.

21140351 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 21140351 is about 4597.8637430877. The cubic root of 21140351 is about 276.5056848041.

Adding to 21140351 its reverse (15304112), we get a palindrome (36444463).

The spelling of 21140351 in words is "twenty-one million, one hundred forty thousand, three hundred fifty-one".