1221213001300 has 36 divisors (see below), whose sum is σ = 2805916464540. Its totient is φ = 459750776320.

The previous prime is 1221213001297. The next prime is 1221213001343. The reversal of 1221213001300 is 31003121221.

It can be written as a sum of positive squares in 6 ways, for example, as 90027602116 + 1131185399184 = 300046^2 + 1063572^2 .

It is a super-2 number, since 2×1221213001300² (a number of 25 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 11 ways as a sum of consecutive naturals, for example, 359178595 + ... + 359181994.

It is an arithmetic number, because the mean of its divisors is an integer number (77942124015).

Almost surely, 2^{1221213001300} is an apocalyptic number.

1221213001300 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221213001300 is an abundant number, since it is smaller than the sum of its proper divisors (1584703463240).

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

1221213001300 is a wasteful number, since it uses less digits than its factorization.

1221213001300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718360620 (or 718360613 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 1221213001300 its reverse (31003121221), we get a palindrome (1252216122521).

The spelling of 1221213001300 in words is "one trillion, two hundred twenty-one billion, two hundred thirteen million, one thousand, three hundred".