21542032402 has 16 divisors (see below), whose sum is σ = 35461685952. Its totient is φ = 9733197520.

The previous prime is 21542032361. The next prime is 21542032429. The reversal of 21542032402 is 20423024512.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2928013 + ... + 2935360.

It is an arithmetic number, because the mean of its divisors is an integer number (2216355372).

Almost surely, 2^21542032402 is an apocalyptic number.

21542032402 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21542032402 is a deficient number, since it is larger than the sum of its proper divisors (13919653550).

21542032402 is a wasteful number, since it uses less digits than its factorization.

21542032402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5863553.

The product of its (nonzero) digits is 3840, while the sum is 25.

Adding to 21542032402 its reverse (20423024512), we get a palindrome (41965056914).

The spelling of 21542032402 in words is "twenty-one billion, five hundred forty-two million, thirty-two thousand, four hundred two".