1221705210550 has 48 divisors (see below), whose sum is σ = 2586731438592. Its totient is φ = 424940938400.

The previous prime is 1221705210547. The next prime is 1221705210587. The reversal of 1221705210550 is 550125071221.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 48276094 + ... + 48301393.

It is an arithmetic number, because the mean of its divisors is an integer number (53890238304).

Almost surely, 2^{1221705210550} is an apocalyptic number.

1221705210550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221705210550 is an abundant number, since it is smaller than the sum of its proper divisors (1365026228042).

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

1221705210550 is a wasteful number, since it uses less digits than its factorization.

1221705210550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96577533 (or 96577528 counting only the distinct ones).

The product of its (nonzero) digits is 7000, while the sum is 31.

The spelling of 1221705210550 in words is "one trillion, two hundred twenty-one billion, seven hundred five million, two hundred ten thousand, five hundred fifty".