1211225355320 has 32 divisors (see below), whose sum is σ = 2728975065120. Its totient is φ = 483829161600.

The previous prime is 1211225355311. The next prime is 1211225355331. The reversal of 1211225355320 is 235535221121.

It is a super-3 number, since 3×1211225355320³ (a number of 37 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20625956 + ... + 20684595.

It is an arithmetic number, because the mean of its divisors is an integer number (85280470785).

Almost surely, 2^{1211225355320} is an apocalyptic number.

1211225355320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211225355320 is an abundant number, since it is smaller than the sum of its proper divisors (1517749709800).

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

1211225355320 is a wasteful number, since it uses less digits than its factorization.

1211225355320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41311295 (or 41311291 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 32.

The spelling of 1211225355320 in words is "one trillion, two hundred eleven billion, two hundred twenty-five million, three hundred fifty-five thousand, three hundred twenty".