21250142133 has 16 divisors (see below), whose sum is σ = 30976368192. Its totient is φ = 12850928000.

The previous prime is 21250142099. The next prime is 21250142237. The reversal of 21250142133 is 33124105212.

It is a cyclic number.

It is not a de Polignac number, because 21250142133 - 2³³ = 12660207541 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21250142833) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 683208 + ... + 713633.

It is an arithmetic number, because the mean of its divisors is an integer number (1936023012).

Almost surely, 2^21250142133 is an apocalyptic number.

It is an amenable number.

21250142133 is a deficient number, since it is larger than the sum of its proper divisors (9726226059).

21250142133 is a wasteful number, since it uses less digits than its factorization.

21250142133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1397316.

The product of its (nonzero) digits is 1440, while the sum is 24.

Adding to 21250142133 its reverse (33124105212), we get a palindrome (54374247345).

The spelling of 21250142133 in words is "twenty-one billion, two hundred fifty million, one hundred forty-two thousand, one hundred thirty-three".