21125222032 has 40 divisors (see below), whose sum is σ = 41118584760. Its totient is φ = 10514088960.

The previous prime is 21125222021. The next prime is 21125222033. The reversal of 21125222032 is 23022252112.

It can be written as a sum of positive squares in 4 ways, for example, as 83978896 + 21041243136 = 9164^2 + 145056^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21125221994 and 21125222012.

It is not an unprimeable number, because it can be changed into a prime (21125222033) 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, 3392682 + ... + 3398902.

It is an arithmetic number, because the mean of its divisors is an integer number (1027964619).

Almost surely, 2^21125222032 is an apocalyptic number.

It is an amenable number.

21125222032 is a deficient number, since it is larger than the sum of its proper divisors (19993362728).

21125222032 is a wasteful number, since it uses less digits than its factorization.

21125222032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7171 (or 7165 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

Adding to 21125222032 its reverse (23022252112), we get a palindrome (44147474144).

The spelling of 21125222032 in words is "twenty-one billion, one hundred twenty-five million, two hundred twenty-two thousand, thirty-two".