21052247146 has 8 divisors (see below), whose sum is σ = 36089566560. Its totient is φ = 9022391628.

The previous prime is 21052247137. The next prime is 21052247197. The reversal of 21052247146 is 64174225012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 751865956 + ... + 751865983.

It is an arithmetic number, because the mean of its divisors is an integer number (4511195820).

Almost surely, 2^21052247146 is an apocalyptic number.

21052247146 is a deficient number, since it is larger than the sum of its proper divisors (15037319414).

21052247146 is a wasteful number, since it uses less digits than its factorization.

21052247146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1503731948.

The product of its (nonzero) digits is 26880, while the sum is 34.

The spelling of 21052247146 in words is "twenty-one billion, fifty-two million, two hundred forty-seven thousand, one hundred forty-six".