21150042133221 has 16 divisors (see below), whose sum is σ = 31464497836800. Its totient is φ = 14041032151104.

The previous prime is 21150042133193. The next prime is 21150042133229. The reversal of 21150042133221 is 12233124005112.

It is a happy number.

21150042133221 is a `hidden beast` number, since 2 + 1 + 1 + 500 + 4 + 2 + 133 + 2 + 21 = 666.

It is not a de Polignac number, because 21150042133221 - 2¹⁹ = 21150041608933 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21150042133229) 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, 1638769476 + ... + 1638782381.

It is an arithmetic number, because the mean of its divisors is an integer number (1966531114800).

Almost surely, 2^{21150042133221} is an apocalyptic number.

It is an amenable number.

21150042133221 is a deficient number, since it is larger than the sum of its proper divisors (10314455703579).

21150042133221 is a wasteful number, since it uses less digits than its factorization.

21150042133221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3277552105 (or 3277552099 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

Adding to 21150042133221 its reverse (12233124005112), we get a palindrome (33383166138333).

The spelling of 21150042133221 in words is "twenty-one trillion, one hundred fifty billion, forty-two million, one hundred thirty-three thousand, two hundred twenty-one".