21543143402 has 32 divisors (see below), whose sum is σ = 36198646848. Its totient is φ = 9530640000.

The previous prime is 21543143389. The next prime is 21543143417. The reversal of 21543143402 is 20434134512.

It is a super-2 number, since 2×21543143402² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 351377 + ... + 408107.

It is an arithmetic number, because the mean of its divisors is an integer number (1131207714).

Almost surely, 2^21543143402 is an apocalyptic number.

21543143402 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21543143402 is a deficient number, since it is larger than the sum of its proper divisors (14655503446).

21543143402 is a wasteful number, since it uses less digits than its factorization.

21543143402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57206.

The product of its (nonzero) digits is 11520, while the sum is 29.

Adding to 21543143402 its reverse (20434134512), we get a palindrome (41977277914).

The spelling of 21543143402 in words is "twenty-one billion, five hundred forty-three million, one hundred forty-three thousand, four hundred two".