1249041021 has 8 divisors (see below), whose sum is σ = 1685453280. Its totient is φ = 822661392.

The previous prime is 1249040993. The next prime is 1249041037. The reversal of 1249041021 is 1201409421.

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

It is not a de Polignac number, because 1249041021 - 2⁶ = 1249040957 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1249040982 and 1249041000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1249041061) 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, 2507866 + ... + 2508363.

It is an arithmetic number, because the mean of its divisors is an integer number (210681660).

Almost surely, 2^1249041021 is an apocalyptic number.

It is an amenable number.

1249041021 is a deficient number, since it is larger than the sum of its proper divisors (436412259).

1249041021 is an equidigital number, since it uses as much as digits as its factorization.

1249041021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5016315.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 1249041021 is about 35341.7744461140. The cubic root of 1249041021 is about 1076.9418001895.

The spelling of 1249041021 in words is "one billion, two hundred forty-nine million, forty-one thousand, twenty-one".