21436101042 has 32 divisors (see below), whose sum is σ = 44358641280. Its totient is φ = 6897717120.

The previous prime is 21436101041. The next prime is 21436101109. The reversal of 21436101042 is 24010163412.

It is not an unprimeable number, because it can be changed into a prime (21436101041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1648438 + ... + 1661390.

It is an arithmetic number, because the mean of its divisors is an integer number (1386207540).

Almost surely, 2^21436101042 is an apocalyptic number.

21436101042 is an abundant number, since it is smaller than the sum of its proper divisors (22922540238).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21436101042 is a wasteful number, since it uses less digits than its factorization.

21436101042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22498.

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 21436101042 its reverse (24010163412), we get a palindrome (45446264454).

The spelling of 21436101042 in words is "twenty-one billion, four hundred thirty-six million, one hundred one thousand, forty-two".