21226233501 has 24 divisors (see below), whose sum is σ = 33995725920. Its totient is φ = 12653488800.

The previous prime is 21226233487. The next prime is 21226233559. The reversal of 21226233501 is 10533262212.

It is a happy number.

21226233501 is a `hidden beast` number, since 2 + 1 + 2 + 2 + 623 + 35 + 0 + 1 = 666.

It is not a de Polignac number, because 21226233501 - 2⁶ = 21226233437 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21226233601) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1751391 + ... + 1763468.

It is an arithmetic number, because the mean of its divisors is an integer number (1416488580).

Almost surely, 2^21226233501 is an apocalyptic number.

It is an amenable number.

21226233501 is a deficient number, since it is larger than the sum of its proper divisors (12769492419).

21226233501 is a wasteful number, since it uses less digits than its factorization.

21226233501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3514937 (or 3514934 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

Adding to 21226233501 its reverse (10533262212), we get a palindrome (31759495713).

The spelling of 21226233501 in words is "twenty-one billion, two hundred twenty-six million, two hundred thirty-three thousand, five hundred one".