1251011223011 has 8 divisors (see below), whose sum is σ = 1377494092224. Its totient is φ = 1126654116520.

The previous prime is 1251011222983. The next prime is 1251011223023. The reversal of 1251011223011 is 1103221101521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1251011223011 - 2³⁰ = 1249937481187 is a prime.

It is a super-2 number, since 2×1251011223011² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1251011223071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 531439445 + ... + 531441798.

It is an arithmetic number, because the mean of its divisors is an integer number (172186761528).

Almost surely, 2^{1251011223011} is an apocalyptic number.

1251011223011 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1251011223011 is a deficient number, since it is larger than the sum of its proper divisors (126482869213).

1251011223011 is a wasteful number, since it uses less digits than its factorization.

1251011223011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1062881361.

The product of its (nonzero) digits is 120, while the sum is 20.

Adding to 1251011223011 its reverse (1103221101521), we get a palindrome (2354232324532).

The spelling of 1251011223011 in words is "one trillion, two hundred fifty-one billion, eleven million, two hundred twenty-three thousand, eleven".