21354242011 has 32 divisors (see below), whose sum is σ = 23451918336. Its totient is φ = 19363968000.

The previous prime is 21354241973. The next prime is 21354242023. The reversal of 21354242011 is 11024245312.

It is a cyclic number.

It is not a de Polignac number, because 21354242011 - 2¹³ = 21354233819 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21354242081) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24743766 + ... + 24744628.

It is an arithmetic number, because the mean of its divisors is an integer number (732872448).

Almost surely, 2^21354242011 is an apocalyptic number.

21354242011 is a deficient number, since it is larger than the sum of its proper divisors (2097676325).

21354242011 is a wasteful number, since it uses less digits than its factorization.

21354242011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1323.

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 21354242011 its reverse (11024245312), we get a palindrome (32378487323).

The spelling of 21354242011 in words is "twenty-one billion, three hundred fifty-four million, two hundred forty-two thousand, eleven".