1212491661290 has 64 divisors (see below), whose sum is σ = 2688847902720. Its totient is φ = 383346120960.

The previous prime is 1212491661133. The next prime is 1212491661377. The reversal of 1212491661290 is 921661942121.

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, 229556 + ... + 1574064.

It is an arithmetic number, because the mean of its divisors is an integer number (42013248480).

Almost surely, 2^{1212491661290} is an apocalyptic number.

1212491661290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1212491661290 is an abundant number, since it is smaller than the sum of its proper divisors (1476356241430).

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

1212491661290 is a wasteful number, since it uses less digits than its factorization.

1212491661290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1345527.

The product of its (nonzero) digits is 93312, while the sum is 44.

It can be divided in two parts, 1212491 and 661290, that added together give a palindrome (1873781).

The spelling of 1212491661290 in words is "one trillion, two hundred twelve billion, four hundred ninety-one million, six hundred sixty-one thousand, two hundred ninety".