15511421001 has 32 divisors (see below), whose sum is σ = 21920510080. Its totient is φ = 9729331200.

The previous prime is 15511420997. The next prime is 15511421017. The reversal of 15511421001 is 10012411551.

It is not a de Polignac number, because 15511421001 - 2² = 15511420997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15511421021) 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, 11231331 + ... + 11232711.

It is an arithmetic number, because the mean of its divisors is an integer number (685015940).

Almost surely, 2^15511421001 is an apocalyptic number.

It is an amenable number.

15511421001 is a deficient number, since it is larger than the sum of its proper divisors (6409089079).

15511421001 is a wasteful number, since it uses less digits than its factorization.

15511421001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2617.

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

Adding to 15511421001 its reverse (10012411551), we get a palindrome (25523832552).

The spelling of 15511421001 in words is "fifteen billion, five hundred eleven million, four hundred twenty-one thousand, one".