21765125630 has 16 divisors (see below), whose sum is σ = 40880584224. Its totient is φ = 8327526240.

The previous prime is 21765125621. The next prime is 21765125647. The reversal of 21765125630 is 3652156712.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47315261 + ... + 47315720.

It is an arithmetic number, because the mean of its divisors is an integer number (2555036514).

Almost surely, 2^21765125630 is an apocalyptic number.

21765125630 is a deficient number, since it is larger than the sum of its proper divisors (19115458594).

21765125630 is a wasteful number, since it uses less digits than its factorization.

21765125630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94631011.

The product of its (nonzero) digits is 75600, while the sum is 38.

The spelling of 21765125630 in words is "twenty-one billion, seven hundred sixty-five million, one hundred twenty-five thousand, six hundred thirty".