1211872515342 has 64 divisors (see below), whose sum is σ = 2474606937600. Its totient is φ = 395580616704.

The previous prime is 1211872515323. The next prime is 1211872515377. The reversal of 1211872515342 is 2435152781121.

It is a junction number, because it is equal to n+sod(n) for n = 1211872515294 and 1211872515303.

It is a congruent number.

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, 39378453 + ... + 39409215.

It is an arithmetic number, because the mean of its divisors is an integer number (38665733400).

Almost surely, 2^{1211872515342} is an apocalyptic number.

1211872515342 is an abundant number, since it is smaller than the sum of its proper divisors (1262734422258).

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

1211872515342 is a wasteful number, since it uses less digits than its factorization.

1211872515342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31577.

The product of its digits is 134400, while the sum is 42.

The spelling of 1211872515342 in words is "one trillion, two hundred eleven billion, eight hundred seventy-two million, five hundred fifteen thousand, three hundred forty-two".