10199621787 has 8 divisors (see below), whose sum is σ = 13802473536. Its totient is φ = 6698258952.

The previous prime is 10199621759. The next prime is 10199621797. The reversal of 10199621787 is 78712699101.

It is a happy number.

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

It is not a de Polignac number, because 10199621787 - 2¹⁰ = 10199620763 is a prime.

It is not an unprimeable number, because it can be changed into a prime (10199621737) 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, 25371993 + ... + 25372394.

It is an arithmetic number, because the mean of its divisors is an integer number (1725309192).

Almost surely, 2^10199621787 is an apocalyptic number.

10199621787 is a deficient number, since it is larger than the sum of its proper divisors (3602851749).

10199621787 is an equidigital number, since it uses as much as digits as its factorization.

10199621787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50744457.

The product of its (nonzero) digits is 381024, while the sum is 51.

The spelling of 10199621787 in words is "ten billion, one hundred ninety-nine million, six hundred twenty-one thousand, seven hundred eighty-seven".