11211201615220 has 48 divisors (see below), whose sum is σ = 24305119262928. Its totient is φ = 4340670750720.

The previous prime is 11211201615203. The next prime is 11211201615239. The reversal of 11211201615220 is 2251610211211.

It can be written as a sum of positive squares in 8 ways, for example, as 987105835024 + 10224095780196 = 993532^2 + 3197514^2 .

It is a super-2 number, since 2×11211201615220² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39106591 + ... + 39392230.

It is an arithmetic number, because the mean of its divisors is an integer number (506356651311).

Almost surely, 2^{11211201615220} is an apocalyptic number.

11211201615220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11211201615220 is an abundant number, since it is smaller than the sum of its proper divisors (13093917647708).

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

11211201615220 is a wasteful number, since it uses less digits than its factorization.

11211201615220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78499060 (or 78499058 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 25.

Adding to 11211201615220 its reverse (2251610211211), we get a palindrome (13462811826431).

The spelling of 11211201615220 in words is "eleven trillion, two hundred eleven billion, two hundred one million, six hundred fifteen thousand, two hundred twenty".