21540041350 has 24 divisors (see below), whose sum is σ = 40240993608. Its totient is φ = 8578056000.

The previous prime is 21540041339. The next prime is 21540041357. The reversal of 21540041350 is 5314004512.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21540041357) 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, 937551 + ... + 960250.

It is an arithmetic number, because the mean of its divisors is an integer number (1676708067).

Almost surely, 2^21540041350 is an apocalyptic number.

21540041350 is a deficient number, since it is larger than the sum of its proper divisors (18700952258).

21540041350 is a wasteful number, since it uses less digits than its factorization.

21540041350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1898040 (or 1898035 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

Adding to 21540041350 its reverse (5314004512), we get a palindrome (26854045862).

The spelling of 21540041350 in words is "twenty-one billion, five hundred forty million, forty-one thousand, three hundred fifty".