1213450221540 has 72 divisors (see below), whose sum is σ = 3471489749952. Its totient is φ = 316701867200.

The previous prime is 1213450221491. The next prime is 1213450221559. The reversal of 1213450221540 is 451220543121.

It is a super-2 number, since 2×1213450221540² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1213450221498 and 1213450221507.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4445136 + ... + 4710215.

It is an arithmetic number, because the mean of its divisors is an integer number (48215135416).

Almost surely, 2^{1213450221540} is an apocalyptic number.

1213450221540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213450221540 is an abundant number, since it is smaller than the sum of its proper divisors (2258039528412).

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

1213450221540 is a wasteful number, since it uses less digits than its factorization.

1213450221540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9155457 (or 9155408 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 30.

Adding to 1213450221540 its reverse (451220543121), we get a palindrome (1664670764661).

The spelling of 1213450221540 in words is "one trillion, two hundred thirteen billion, four hundred fifty million, two hundred twenty-one thousand, five hundred forty".