11211405051 has 32 divisors (see below), whose sum is σ = 19033694208. Its totient is φ = 5700183840.

The previous prime is 11211405047. The next prime is 11211405053. The reversal of 11211405051 is 15050411211.

It is not a de Polignac number, because 11211405051 - 2² = 11211405047 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (11211405053) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 505465 + ... + 527178.

It is an arithmetic number, because the mean of its divisors is an integer number (594802944).

Almost surely, 2^11211405051 is an apocalyptic number.

11211405051 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11211405051 is a deficient number, since it is larger than the sum of its proper divisors (7822289157).

11211405051 is a wasteful number, since it uses less digits than its factorization.

11211405051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1032711.

The product of its (nonzero) digits is 200, while the sum is 21.

Adding to 11211405051 its reverse (15050411211), we get a palindrome (26261816262).

The spelling of 11211405051 in words is "eleven billion, two hundred eleven million, four hundred five thousand, fifty-one".