21125334146 has 8 divisors (see below), whose sum is σ = 36214858560. Its totient is φ = 9053714628.

The previous prime is 21125334127. The next prime is 21125334157. The reversal of 21125334146 is 64143352112.

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, 754476206 + ... + 754476233.

It is an arithmetic number, because the mean of its divisors is an integer number (4526857320).

Almost surely, 2^21125334146 is an apocalyptic number.

21125334146 is a deficient number, since it is larger than the sum of its proper divisors (15089524414).

21125334146 is a wasteful number, since it uses less digits than its factorization.

21125334146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1508952448.

The product of its digits is 17280, while the sum is 32.

Adding to 21125334146 its reverse (64143352112), we get a palindrome (85268686258).

The spelling of 21125334146 in words is "twenty-one billion, one hundred twenty-five million, three hundred thirty-four thousand, one hundred forty-six".