21254140051502 has 16 divisors (see below), whose sum is σ = 32058207844992. Its totient is φ = 10568172058080.

The previous prime is 21254140051489. The next prime is 21254140051601. The reversal of 21254140051502 is 20515004145212.

It is a super-2 number, since 2×21254140051502² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24901793 + ... + 25741164.

It is an arithmetic number, because the mean of its divisors is an integer number (2003637990312).

Almost surely, 2^{21254140051502} is an apocalyptic number.

21254140051502 is a deficient number, since it is larger than the sum of its proper divisors (10804067793490).

21254140051502 is a wasteful number, since it uses less digits than its factorization.

21254140051502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50644123.

The product of its (nonzero) digits is 16000, while the sum is 32.

Adding to 21254140051502 its reverse (20515004145212), we get a palindrome (41769144196714).

The spelling of 21254140051502 in words is "twenty-one trillion, two hundred fifty-four billion, one hundred forty million, fifty-one thousand, five hundred two".