1101220515551 has 16 divisors (see below), whose sum is σ = 1189942942944. Its totient is φ = 1013076440064.

The previous prime is 1101220515541. The next prime is 1101220515553. The reversal of 1101220515551 is 1555150221011.

It is not a de Polignac number, because 1101220515551 - 2²⁶ = 1101153406687 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1101220515553) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5169980 + ... + 5378766.

It is an arithmetic number, because the mean of its divisors is an integer number (74371433934).

Almost surely, 2^{1101220515551} is an apocalyptic number.

1101220515551 is a deficient number, since it is larger than the sum of its proper divisors (88722427393).

1101220515551 is a wasteful number, since it uses less digits than its factorization.

1101220515551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210170.

The product of its (nonzero) digits is 2500, while the sum is 29.

Adding to 1101220515551 its reverse (1555150221011), we get a palindrome (2656370736562).

The spelling of 1101220515551 in words is "one trillion, one hundred one billion, two hundred twenty million, five hundred fifteen thousand, five hundred fifty-one".