21122625747 has 8 divisors (see below), whose sum is σ = 28164211344. Its totient is φ = 14081395328.

The previous prime is 21122625739. The next prime is 21122625751. The reversal of 21122625747 is 74752622112.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21122625747 - 2³ = 21122625739 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21122625787) 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, 120343 + ... + 238175.

It is an arithmetic number, because the mean of its divisors is an integer number (3520526418).

Almost surely, 2^21122625747 is an apocalyptic number.

21122625747 is a deficient number, since it is larger than the sum of its proper divisors (7041585597).

21122625747 is a wasteful number, since it uses less digits than its factorization.

21122625747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177589.

The product of its digits is 94080, while the sum is 39.

The spelling of 21122625747 in words is "twenty-one billion, one hundred twenty-two million, six hundred twenty-five thousand, seven hundred forty-seven".