21000131420433 has 32 divisors (see below), whose sum is σ = 30687401152512. Its totient is φ = 12668325571200.

The previous prime is 21000131420431. The next prime is 21000131420449. The reversal of 21000131420433 is 33402413100012.

It is a happy number.

It is not a de Polignac number, because 21000131420433 - 2¹ = 21000131420431 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21000131420431) 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, 21725128 + ... + 22671158.

It is an arithmetic number, because the mean of its divisors is an integer number (958981286016).

Almost surely, 2^{21000131420433} is an apocalyptic number.

It is an amenable number.

21000131420433 is a deficient number, since it is larger than the sum of its proper divisors (9687269732079).

21000131420433 is a wasteful number, since it uses less digits than its factorization.

21000131420433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 949165.

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 21000131420433 its reverse (33402413100012), we get a palindrome (54402544520445).

The spelling of 21000131420433 in words is "twenty-one trillion, one hundred thirty-one million, four hundred twenty thousand, four hundred thirty-three".