21125251322 has 40 divisors (see below), whose sum is σ = 37029096756. Its totient is φ = 9038472576.

The previous prime is 21125251307. The next prime is 21125251349. The reversal of 21125251322 is 22315252112.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20739168121 + 386083201 = 144011^2 + 19649^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21125251291 and 21125251300.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3132338 + ... + 3139074.

Almost surely, 2^21125251322 is an apocalyptic number.

21125251322 is a deficient number, since it is larger than the sum of its proper divisors (15903845434).

21125251322 is an frugal number, since it uses more digits than its factorization.

21125251322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7420 (or 7399 counting only the distinct ones).

The product of its digits is 2400, while the sum is 26.

The spelling of 21125251322 in words is "twenty-one billion, one hundred twenty-five million, two hundred fifty-one thousand, three hundred twenty-two".