1211501244140 has 48 divisors (see below), whose sum is σ = 2775518917920. Its totient is φ = 440533255680.

The previous prime is 1211501244131. The next prime is 1211501244143. The reversal of 1211501244140 is 414421051121.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1211501244143) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11335994 + ... + 11442366.

It is an arithmetic number, because the mean of its divisors is an integer number (57823310790).

Almost surely, 2^{1211501244140} is an apocalyptic number.

1211501244140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211501244140 is an abundant number, since it is smaller than the sum of its proper divisors (1564017673780).

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

1211501244140 is a wasteful number, since it uses less digits than its factorization.

1211501244140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158162 (or 158160 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 26.

Adding to 1211501244140 its reverse (414421051121), we get a palindrome (1625922295261).

The spelling of 1211501244140 in words is "one trillion, two hundred eleven billion, five hundred one million, two hundred forty-four thousand, one hundred forty".