1245311101220 has 24 divisors (see below), whose sum is σ = 2616303937464. Its totient is φ = 497905273856.

The previous prime is 1245311101187. The next prime is 1245311101271. The reversal of 1245311101220 is 221011135421.

It can be written as a sum of positive squares in 4 ways, for example, as 148570160704 + 1096740940516 = 385448^2 + 1047254^2 .

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, 13651319 + ... + 13742238.

It is an arithmetic number, because the mean of its divisors is an integer number (109012664061).

Almost surely, 2^{1245311101220} is an apocalyptic number.

1245311101220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1245311101220 is an abundant number, since it is smaller than the sum of its proper divisors (1370992836244).

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

1245311101220 is a wasteful number, since it uses less digits than its factorization.

1245311101220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27395839 (or 27395837 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 23.

Adding to 1245311101220 its reverse (221011135421), we get a palindrome (1466322236641).

The spelling of 1245311101220 in words is "one trillion, two hundred forty-five billion, three hundred eleven million, one hundred one thousand, two hundred twenty".