21571401044701 has 2 divisors, whose sum is σ = 21571401044702. Its totient is φ = 21571401044700.

The previous prime is 21571401044671. The next prime is 21571401044717. The reversal of 21571401044701 is 10744010417512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18875992311801 + 2695408732900 = 4344651^2 + 1641770^2 .

It is a cyclic number.

It is not a de Polignac number, because 21571401044701 - 2⁹ = 21571401044189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21571401044201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10785700522350 + 10785700522351.

It is an arithmetic number, because the mean of its divisors is an integer number (10785700522351).

Almost surely, 2^{21571401044701} is an apocalyptic number.

It is an amenable number.

21571401044701 is a deficient number, since it is larger than the sum of its proper divisors (1).

21571401044701 is an equidigital number, since it uses as much as digits as its factorization.

21571401044701 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31360, while the sum is 37.

The spelling of 21571401044701 in words is "twenty-one trillion, five hundred seventy-one billion, four hundred one million, forty-four thousand, seven hundred one".