21511400130 has 48 divisors (see below), whose sum is σ = 61014155904. Its totient is φ = 5214884640.

The previous prime is 21511400129. The next prime is 21511400159. The reversal of 21511400130 is 3100411512.

21511400130 is a `hidden beast` number, since 21 + 511 + 4 + 0 + 0 + 130 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10863354 + ... + 10865333.

It is an arithmetic number, because the mean of its divisors is an integer number (1271128248).

Almost surely, 2^21511400130 is an apocalyptic number.

21511400130 is an abundant number, since it is smaller than the sum of its proper divisors (39502755774).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21511400130 is a wasteful number, since it uses less digits than its factorization.

21511400130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21728711 (or 21728708 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

Adding to 21511400130 its reverse (3100411512), we get a palindrome (24611811642).

The spelling of 21511400130 in words is "twenty-one billion, five hundred eleven million, four hundred thousand, one hundred thirty".