21140144212 has 12 divisors (see below), whose sum is σ = 40358457216. Its totient is φ = 9609156440.

The previous prime is 21140144203. The next prime is 21140144243. The reversal of 21140144212 is 21244104112.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 240228868 + ... + 240228955.

It is an arithmetic number, because the mean of its divisors is an integer number (3363204768).

Almost surely, 2^21140144212 is an apocalyptic number.

21140144212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21140144212 is a deficient number, since it is larger than the sum of its proper divisors (19218313004).

21140144212 is a wasteful number, since it uses less digits than its factorization.

21140144212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480457838 (or 480457836 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 21140144212 its reverse (21244104112), we get a palindrome (42384248324).

The spelling of 21140144212 in words is "twenty-one billion, one hundred forty million, one hundred forty-four thousand, two hundred twelve".