21033142254 has 24 divisors (see below), whose sum is σ = 48252503520. Its totient is φ = 6598632768.

The previous prime is 21033142219. The next prime is 21033142259. The reversal of 21033142254 is 45224133012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21033142259) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34367574 + ... + 34368185.

It is an arithmetic number, because the mean of its divisors is an integer number (2010520980).

Almost surely, 2^21033142254 is an apocalyptic number.

21033142254 is an abundant number, since it is smaller than the sum of its proper divisors (27219361266).

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

21033142254 is a wasteful number, since it uses less digits than its factorization.

21033142254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68735784 (or 68735781 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

Adding to 21033142254 its reverse (45224133012), we get a palindrome (66257275266).

The spelling of 21033142254 in words is "twenty-one billion, thirty-three million, one hundred forty-two thousand, two hundred fifty-four".