21161520162426 has 64 divisors (see below), whose sum is σ = 48551838566400. Its totient is φ = 6023350698816.

The previous prime is 21161520162413. The next prime is 21161520162493. The reversal of 21161520162426 is 62426102516112.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14581285 + ... + 15966743.

It is an arithmetic number, because the mean of its divisors is an integer number (758622477600).

Almost surely, 2^{21161520162426} is an apocalyptic number.

21161520162426 is an abundant number, since it is smaller than the sum of its proper divisors (27390318403974).

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

21161520162426 is a wasteful number, since it uses less digits than its factorization.

21161520162426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1386843.

The product of its (nonzero) digits is 69120, while the sum is 39.

Adding to 21161520162426 its reverse (62426102516112), we get a palindrome (83587622678538).

The spelling of 21161520162426 in words is "twenty-one trillion, one hundred sixty-one billion, five hundred twenty million, one hundred sixty-two thousand, four hundred twenty-six".