21476636451770 has 16 divisors (see below), whose sum is σ = 39092304554280. Its totient is φ = 8494130371584.

The previous prime is 21476636451731. The next prime is 21476636451791. The reversal of 21476636451770 is 7715463667412.

It can be written as a sum of positive squares in 4 ways, for example, as 16764103171201 + 4712533280569 = 4094399^2 + 2170837^2 .

It is a super-2 number, since 2×21476636451770² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12065525207 + ... + 12065526986.

Almost surely, 2^{21476636451770} is an apocalyptic number.

21476636451770 is a deficient number, since it is larger than the sum of its proper divisors (17615668102510).

21476636451770 is a wasteful number, since it uses less digits than its factorization.

21476636451770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24131052289.

The product of its (nonzero) digits is 35562240, while the sum is 59.

The spelling of 21476636451770 in words is "twenty-one trillion, four hundred seventy-six billion, six hundred thirty-six million, four hundred fifty-one thousand, seven hundred seventy".