1225166747021 has 8 divisors (see below), whose sum is σ = 1434341557824. Its totient is φ = 1024529683680.

The previous prime is 1225166746967. The next prime is 1225166747023. The reversal of 1225166747021 is 1207476615221.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1225166747021 - 2¹⁸ = 1225166484877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225166747023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2134436555 + ... + 2134437128.

It is an arithmetic number, because the mean of its divisors is an integer number (179292694728).

Almost surely, 2^{1225166747021} is an apocalyptic number.

It is an amenable number.

1225166747021 is a deficient number, since it is larger than the sum of its proper divisors (209174810803).

1225166747021 is an equidigital number, since it uses as much as digits as its factorization.

1225166747021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4268873731.

The product of its (nonzero) digits is 282240, while the sum is 44.

The spelling of 1225166747021 in words is "one trillion, two hundred twenty-five billion, one hundred sixty-six million, seven hundred forty-seven thousand, twenty-one".