1221480972767 has 4 divisors (see below), whose sum is σ = 1332524697576. Its totient is φ = 1110437247960.

The previous prime is 1221480972667. The next prime is 1221480972787. The reversal of 1221480972767 is 7672790841221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1221480972767 - 2¹⁴ = 1221480956383 is a prime.

It is a super-4 number, since 4×1221480972767⁴ (a number of 49 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221480972787) 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, 55521862388 + ... + 55521862409.

It is an arithmetic number, because the mean of its divisors is an integer number (333131174394).

Almost surely, 2^{1221480972767} is an apocalyptic number.

1221480972767 is a deficient number, since it is larger than the sum of its proper divisors (111043724809).

1221480972767 is a wasteful number, since it uses less digits than its factorization.

1221480972767 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111043724808.

The product of its (nonzero) digits is 4741632, while the sum is 56.

The spelling of 1221480972767 in words is "one trillion, two hundred twenty-one billion, four hundred eighty million, nine hundred seventy-two thousand, seven hundred sixty-seven".