21145406122 has 16 divisors (see below), whose sum is σ = 32378898600. Its totient is φ = 10353954240.

The previous prime is 21145406111. The next prime is 21145406129. The reversal of 21145406122 is 22160454112.

It can be written as a sum of positive squares in 4 ways, for example, as 20549509201 + 595896921 = 143351^2 + 24411^2 .

It is not an unprimeable number, because it can be changed into a prime (21145406129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 350497 + ... + 406372.

Almost surely, 2^21145406122 is an apocalyptic number.

21145406122 is a deficient number, since it is larger than the sum of its proper divisors (11233492478).

21145406122 is a wasteful number, since it uses less digits than its factorization.

21145406122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 757161.

The product of its (nonzero) digits is 3840, while the sum is 28.

The spelling of 21145406122 in words is "twenty-one billion, one hundred forty-five million, four hundred six thousand, one hundred twenty-two".