1221201211095 has 64 divisors (see below), whose sum is σ = 2233025794560. Its totient is φ = 632863881216.

The previous prime is 1221201211093. The next prime is 1221201211099. The reversal of 1221201211095 is 5901121021221.

It is not a de Polignac number, because 1221201211095 - 2¹ = 1221201211093 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221201211093) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 575364 + ... + 1665366.

It is an arithmetic number, because the mean of its divisors is an integer number (34891028040).

Almost surely, 2^{1221201211095} is an apocalyptic number.

1221201211095 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1221201211095 is a deficient number, since it is larger than the sum of its proper divisors (1011824583465).

1221201211095 is a wasteful number, since it uses less digits than its factorization.

1221201211095 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1090253 (or 1090247 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 27.

The spelling of 1221201211095 in words is "one trillion, two hundred twenty-one billion, two hundred one million, two hundred eleven thousand, ninety-five".