21540214102 has 64 divisors (see below), whose sum is σ = 36522316800. Its totient is φ = 9444314880.

The previous prime is 21540214093. The next prime is 21540214103. The reversal of 21540214102 is 20141204512.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21540214103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34910898 + ... + 34911514.

It is an arithmetic number, because the mean of its divisors is an integer number (570661200).

Almost surely, 2^21540214102 is an apocalyptic number.

21540214102 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21540214102 is a deficient number, since it is larger than the sum of its proper divisors (14982102698).

21540214102 is a wasteful number, since it uses less digits than its factorization.

21540214102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1141.

The product of its (nonzero) digits is 640, while the sum is 22.

Adding to 21540214102 its reverse (20141204512), we get a palindrome (41681418614).

The spelling of 21540214102 in words is "twenty-one billion, five hundred forty million, two hundred fourteen thousand, one hundred two".