21106471753 has 2 divisors, whose sum is σ = 21106471754. Its totient is φ = 21106471752.

The previous prime is 21106471747. The next prime is 21106471769. The reversal of 21106471753 is 35717460112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21105406729 + 1065024 = 145277^2 + 1032^2 .

It is a cyclic number.

It is not a de Polignac number, because 21106471753 - 2¹⁷ = 21106340681 is a prime.

It is not a weakly prime, because it can be changed into another prime (21106471553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10553235876 + 10553235877.

It is an arithmetic number, because the mean of its divisors is an integer number (10553235877).

Almost surely, 2^21106471753 is an apocalyptic number.

It is an amenable number.

21106471753 is a deficient number, since it is larger than the sum of its proper divisors (1).

21106471753 is an equidigital number, since it uses as much as digits as its factorization.

21106471753 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 35280, while the sum is 37.

The spelling of 21106471753 in words is "twenty-one billion, one hundred six million, four hundred seventy-one thousand, seven hundred fifty-three".