1211354111051 has 16 divisors (see below), whose sum is σ = 1457484725760. Its totient is φ = 983509750080.

The previous prime is 1211354111029. The next prime is 1211354111059. The reversal of 1211354111051 is 1501114531121.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1211354111051 - 2⁶ = 1211354110987 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1211354111051.

It is not an unprimeable number, because it can be changed into a prime (1211354111059) 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, 225650 + ... + 1572776.

It is an arithmetic number, because the mean of its divisors is an integer number (91092795360).

Almost surely, 2^{1211354111051} is an apocalyptic number.

1211354111051 is a deficient number, since it is larger than the sum of its proper divisors (246130614709).

1211354111051 is a wasteful number, since it uses less digits than its factorization.

1211354111051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1353914.

The product of its (nonzero) digits is 600, while the sum is 26.

Adding to 1211354111051 its reverse (1501114531121), we get a palindrome (2712468642172).

The spelling of 1211354111051 in words is "one trillion, two hundred eleven billion, three hundred fifty-four million, one hundred eleven thousand, fifty-one".