10021557149 has 4 divisors (see below), whose sum is σ = 10046800764. Its totient is φ = 9996313536.

The previous prime is 10021557131. The next prime is 10021557151. The reversal of 10021557149 is 94175512001.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94175512001 = 47189 ⋅1995709.

It can be written as a sum of positive squares in 2 ways, for example, as 2544496249 + 7477060900 = 50443^2 + 86470^2 .

It is a cyclic number.

It is not a de Polignac number, because 10021557149 - 2¹² = 10021553053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10021557109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12621212 + ... + 12622005.

It is an arithmetic number, because the mean of its divisors is an integer number (2511700191).

Almost surely, 2^10021557149 is an apocalyptic number.

It is an amenable number.

10021557149 is a deficient number, since it is larger than the sum of its proper divisors (25243615).

10021557149 is an equidigital number, since it uses as much as digits as its factorization.

10021557149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25243614.

The product of its (nonzero) digits is 12600, while the sum is 35.

The spelling of 10021557149 in words is "ten billion, twenty-one million, five hundred fifty-seven thousand, one hundred forty-nine".