1221275217054 has 16 divisors (see below), whose sum is σ = 2442570379920. Its totient is φ = 407088414720.

The previous prime is 1221275217053. The next prime is 1221275217059. The reversal of 1221275217054 is 4507125721221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221275217053) 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, 34212 + ... + 1563240.

It is an arithmetic number, because the mean of its divisors is an integer number (152660648745).

Almost surely, 2^{1221275217054} is an apocalyptic number.

1221275217054 is an abundant number, since it is smaller than the sum of its proper divisors (1221295162866).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221275217054 is a wasteful number, since it uses less digits than its factorization.

1221275217054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1662155.

The product of its (nonzero) digits is 78400, while the sum is 39.

The spelling of 1221275217054 in words is "one trillion, two hundred twenty-one billion, two hundred seventy-five million, two hundred seventeen thousand, fifty-four".