21507532044407 has 2 divisors, whose sum is σ = 21507532044408. Its totient is φ = 21507532044406.

The previous prime is 21507532044347. The next prime is 21507532044409. The reversal of 21507532044407 is 70444023570512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21507532044407 - 2⁸ = 21507532044151 is a prime.

Together with 21507532044409, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21507532044409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10753766022203 + 10753766022204.

It is an arithmetic number, because the mean of its divisors is an integer number (10753766022204).

Almost surely, 2^{21507532044407} is an apocalyptic number.

21507532044407 is a deficient number, since it is larger than the sum of its proper divisors (1).

21507532044407 is an equidigital number, since it uses as much as digits as its factorization.

21507532044407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 940800, while the sum is 44.

The spelling of 21507532044407 in words is "twenty-one trillion, five hundred seven billion, five hundred thirty-two million, forty-four thousand, four hundred seven".