1221864652801 has 8 divisors (see below), whose sum is σ = 1315868249024. Its totient is φ = 1127863057680.

The previous prime is 1221864652787. The next prime is 1221864652807. The reversal of 1221864652801 is 1082564681221.

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 1221864652801 - 2⁹ = 1221864652289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221864652807) 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, 916516 + ... + 1812106.

It is an arithmetic number, because the mean of its divisors is an integer number (164483531128).

Almost surely, 2^{1221864652801} is an apocalyptic number.

It is an amenable number.

1221864652801 is a deficient number, since it is larger than the sum of its proper divisors (94003596223).

1221864652801 is a wasteful number, since it uses less digits than its factorization.

1221864652801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1000551.

The product of its (nonzero) digits is 368640, while the sum is 46.

The spelling of 1221864652801 in words is "one trillion, two hundred twenty-one billion, eight hundred sixty-four million, six hundred fifty-two thousand, eight hundred one".