1221020140260 has 96 divisors (see below), whose sum is σ = 3562125299712. Its totient is φ = 312157042560.

The previous prime is 1221020140259. The next prime is 1221020140337. The reversal of 1221020140260 is 620410201221.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2868562 + ... + 3266601.

It is an arithmetic number, because the mean of its divisors is an integer number (37105471872).

Almost surely, 2^{1221020140260} is an apocalyptic number.

1221020140260 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221020140260 is an abundant number, since it is smaller than the sum of its proper divisors (2341105159452).

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

1221020140260 is a wasteful number, since it uses less digits than its factorization.

1221020140260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6135313 (or 6135311 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 1221020140260 its reverse (620410201221), we get a palindrome (1841430341481).

The spelling of 1221020140260 in words is "one trillion, two hundred twenty-one billion, twenty million, one hundred forty thousand, two hundred sixty".