21350345572 has 6 divisors (see below), whose sum is σ = 37363104758. Its totient is φ = 10675172784.

The previous prime is 21350345563. The next prime is 21350345591. The reversal of 21350345572 is 27554305312.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 20171384676 + 1178960896 = 142026^2 + 34336^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2668793193 + ... + 2668793200.

Almost surely, 2^21350345572 is an apocalyptic number.

It is an amenable number.

21350345572 is a deficient number, since it is larger than the sum of its proper divisors (16012759186).

21350345572 is a wasteful number, since it uses less digits than its factorization.

21350345572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5337586397 (or 5337586395 counting only the distinct ones).

The product of its (nonzero) digits is 126000, while the sum is 37.

The spelling of 21350345572 in words is "twenty-one billion, three hundred fifty million, three hundred forty-five thousand, five hundred seventy-two".