1021001787249 has 16 divisors (see below), whose sum is σ = 1482398241600. Its totient is φ = 622607259456.

The previous prime is 1021001787181. The next prime is 1021001787277. The reversal of 1021001787249 is 9427871001201.

It is not a de Polignac number, because 1021001787249 - 2¹¹ = 1021001785201 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1021001787249.

It is not an unprimeable number, because it can be changed into a prime (1021001787749) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 308831314 + ... + 308834619.

It is an arithmetic number, because the mean of its divisors is an integer number (92649890100).

Almost surely, 2^{1021001787249} is an apocalyptic number.

1021001787249 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1021001787249 is a deficient number, since it is larger than the sum of its proper divisors (461396454351).

1021001787249 is a wasteful number, since it uses less digits than its factorization.

1021001787249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617665984.

The product of its (nonzero) digits is 56448, while the sum is 42.

The spelling of 1021001787249 in words is "one trillion, twenty-one billion, one million, seven hundred eighty-seven thousand, two hundred forty-nine".