21221223134 has 8 divisors (see below), whose sum is σ = 31846571328. Its totient is φ = 10605699360.

The previous prime is 21221223119. The next prime is 21221223137. The reversal of 21221223134 is 43132212212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21221223134² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221223137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2450702 + ... + 2459345.

It is an arithmetic number, because the mean of its divisors is an integer number (3980821416).

Almost surely, 2^21221223134 is an apocalyptic number.

21221223134 is a deficient number, since it is larger than the sum of its proper divisors (10625348194).

21221223134 is a wasteful number, since it uses less digits than its factorization.

21221223134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4912210.

The product of its digits is 1152, while the sum is 23.

Adding to 21221223134 its reverse (43132212212), we get a palindrome (64353435346).

The spelling of 21221223134 in words is "twenty-one billion, two hundred twenty-one million, two hundred twenty-three thousand, one hundred thirty-four".