1221005144054 has 4 divisors (see below), whose sum is σ = 1831507716084. Its totient is φ = 610502572026.

The previous prime is 1221005143993. The next prime is 1221005144057. The reversal of 1221005144054 is 4504415001221.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221005144057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305251286012 + ... + 305251286015.

It is an arithmetic number, because the mean of its divisors is an integer number (457876929021).

Almost surely, 2^{1221005144054} is an apocalyptic number.

1221005144054 is a deficient number, since it is larger than the sum of its proper divisors (610502572030).

1221005144054 is an equidigital number, since it uses as much as digits as its factorization.

1221005144054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610502572029.

The product of its (nonzero) digits is 6400, while the sum is 29.

The spelling of 1221005144054 in words is "one trillion, two hundred twenty-one billion, five million, one hundred forty-four thousand, fifty-four".