21045571129690 has 32 divisors (see below), whose sum is σ = 38597350611456. Its totient is φ = 8259272548800.

The previous prime is 21045571129663. The next prime is 21045571129699. The reversal of 21045571129690 is 9692117554012.

It is a super-2 number, since 2×21045571129690² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21045571129699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41417665 + ... + 41922715.

It is an arithmetic number, because the mean of its divisors is an integer number (1206167206608).

Almost surely, 2^{21045571129690} is an apocalyptic number.

21045571129690 is a deficient number, since it is larger than the sum of its proper divisors (17551779481766).

21045571129690 is a wasteful number, since it uses less digits than its factorization.

21045571129690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 583734.

The product of its (nonzero) digits is 1360800, while the sum is 52.

The spelling of 21045571129690 in words is "twenty-one trillion, forty-five billion, five hundred seventy-one million, one hundred twenty-nine thousand, six hundred ninety".