21231650326 has 16 divisors (see below), whose sum is σ = 32889093120. Its totient is φ = 10268916840.

The previous prime is 21231650311. The next prime is 21231650329. The reversal of 21231650326 is 62305613212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21231650329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71815 + ... + 218221.

It is an arithmetic number, because the mean of its divisors is an integer number (2055568320).

Almost surely, 2^21231650326 is an apocalyptic number.

21231650326 is a deficient number, since it is larger than the sum of its proper divisors (11657442794).

21231650326 is a wasteful number, since it uses less digits than its factorization.

21231650326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148779.

The product of its (nonzero) digits is 12960, while the sum is 31.

The spelling of 21231650326 in words is "twenty-one billion, two hundred thirty-one million, six hundred fifty thousand, three hundred twenty-six".