1221755570001 has 12 divisors (see below), whose sum is σ = 1767609035920. Its totient is φ = 813187871640.

The previous prime is 1221755569997. The next prime is 1221755570017. The reversal of 1221755570001 is 1000755571221.

1221755570001 is a `hidden beast` number, since 1 + 22 + 17 + 55 + 570 + 0 + 0 + 1 = 666.

It is not a de Polignac number, because 1221755570001 - 2² = 1221755569997 is a prime.

It is a super-2 number, since 2×1221755570001² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221755570201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 109647595 + ... + 109658736.

Almost surely, 2^{1221755570001} is an apocalyptic number.

It is an amenable number.

1221755570001 is a deficient number, since it is larger than the sum of its proper divisors (545853465919).

1221755570001 is a wasteful number, since it uses less digits than its factorization.

1221755570001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219306956 (or 219306953 counting only the distinct ones).

The product of its (nonzero) digits is 24500, while the sum is 36.

The spelling of 1221755570001 in words is "one trillion, two hundred twenty-one billion, seven hundred fifty-five million, five hundred seventy thousand, one".