21131131413450 has 48 divisors (see below), whose sum is σ = 52406445147840. Its totient is φ = 5634835125120.

The previous prime is 21131131413439. The next prime is 21131131413467. The reversal of 21131131413450 is 5431413113112.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 4781622 + ... + 8070078.

It is an arithmetic number, because the mean of its divisors is an integer number (1091800940580).

Almost surely, 2^{21131131413450} is an apocalyptic number.

21131131413450 is an abundant number, since it is smaller than the sum of its proper divisors (31275313734390).

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

21131131413450 is a wasteful number, since it uses less digits than its factorization.

21131131413450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3331311 (or 3331306 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

Adding to 21131131413450 its reverse (5431413113112), we get a palindrome (26562544526562).

The spelling of 21131131413450 in words is "twenty-one trillion, one hundred thirty-one billion, one hundred thirty-one million, four hundred thirteen thousand, four hundred fifty".