21232121214 has 16 divisors (see below), whose sum is σ = 42840033552. Its totient is φ = 7014741888.

The previous prime is 21232121213. The next prime is 21232121249. The reversal of 21232121214 is 41212123212.

It is a happy number.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21232121213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15657229 + ... + 15658584.

It is an arithmetic number, because the mean of its divisors is an integer number (2677502097).

Almost surely, 2^21232121214 is an apocalyptic number.

21232121214 is an abundant number, since it is smaller than the sum of its proper divisors (21607912338).

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

21232121214 is a wasteful number, since it uses less digits than its factorization.

21232121214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31315931.

The product of its digits is 384, while the sum is 21.

Adding to 21232121214 its reverse (41212123212), we get a palindrome (62444244426).

The spelling of 21232121214 in words is "twenty-one billion, two hundred thirty-two million, one hundred twenty-one thousand, two hundred fourteen".