21401032291 has 2 divisors, whose sum is σ = 21401032292. Its totient is φ = 21401032290.

The previous prime is 21401032283. The next prime is 21401032307. The reversal of 21401032291 is 19223010412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21401032291 - 2³ = 21401032283 is a prime.

It is not a weakly prime, because it can be changed into another prime (21401002291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10700516145 + 10700516146.

It is an arithmetic number, because the mean of its divisors is an integer number (10700516146).

Almost surely, 2^21401032291 is an apocalyptic number.

21401032291 is a deficient number, since it is larger than the sum of its proper divisors (1).

21401032291 is an equidigital number, since it uses as much as digits as its factorization.

21401032291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 25.

The spelling of 21401032291 in words is "twenty-one billion, four hundred one million, thirty-two thousand, two hundred ninety-one".