1211111212010 has 64 divisors (see below), whose sum is σ = 2507413708800. Its totient is φ = 412579759680.

The previous prime is 1211111211971. The next prime is 1211111212079. The reversal of 1211111212010 is 102121111121.

It is a super-4 number, since 4×1211111212010⁴ (a number of 49 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (14).

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, 10067315 + ... + 10186905.

It is an arithmetic number, because the mean of its divisors is an integer number (39178339200).

Almost surely, 2^{1211111212010} is an apocalyptic number.

1211111212010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1211111212010 is an abundant number, since it is smaller than the sum of its proper divisors (1296302496790).

1211111212010 is a wasteful number, since it uses less digits than its factorization.

1211111212010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120531.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 1211111212010 its reverse (102121111121), we get a palindrome (1313232323131).

The spelling of 1211111212010 in words is "one trillion, two hundred eleven billion, one hundred eleven million, two hundred twelve thousand, ten".