21512454224050 has 12 divisors (see below), whose sum is σ = 40013164856826. Its totient is φ = 8604981689600.

The previous prime is 21512454224033. The next prime is 21512454224081. The reversal of 21512454224050 is 5042245421512.

It can be written as a sum of positive squares in 3 ways, for example, as 14317876506609 + 7194577717441 = 3783897^2 + 2682271^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 215124542191 + ... + 215124542290.

Almost surely, 2^{21512454224050} is an apocalyptic number.

21512454224050 is a deficient number, since it is larger than the sum of its proper divisors (18500710632776).

21512454224050 is a wasteful number, since it uses less digits than its factorization.

21512454224050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430249084493 (or 430249084488 counting only the distinct ones).

The product of its (nonzero) digits is 128000, while the sum is 37.

Adding to 21512454224050 its reverse (5042245421512), we get a palindrome (26554699645562).

The spelling of 21512454224050 in words is "twenty-one trillion, five hundred twelve billion, four hundred fifty-four million, two hundred twenty-four thousand, fifty".