21240145014 has 32 divisors (see below), whose sum is σ = 46348277760. Its totient is φ = 6435554400.

The previous prime is 21240144979. The next prime is 21240145019. The reversal of 21240145014 is 41054104212.

It is a super-2 number, since 2×21240145014² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21240145019) 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, 629772 + ... + 662640.

It is an arithmetic number, because the mean of its divisors is an integer number (1448383680).

Almost surely, 2^21240145014 is an apocalyptic number.

21240145014 is an abundant number, since it is smaller than the sum of its proper divisors (25108132746).

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

21240145014 is a wasteful number, since it uses less digits than its factorization.

21240145014 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42676.

The product of its (nonzero) digits is 1280, while the sum is 24.

Adding to 21240145014 its reverse (41054104212), we get a palindrome (62294249226).

The spelling of 21240145014 in words is "twenty-one billion, two hundred forty million, one hundred forty-five thousand, fourteen".