21275223735 has 32 divisors (see below), whose sum is σ = 35045860608. Its totient is φ = 11014859520.

The previous prime is 21275223659. The next prime is 21275223737. The reversal of 21275223735 is 53732257212.

It is not a de Polignac number, because 21275223735 - 2⁸ = 21275223479 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 21275223693 and 21275223702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21275223737) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3955 + ... + 206315.

It is an arithmetic number, because the mean of its divisors is an integer number (1095183144).

Almost surely, 2^21275223735 is an apocalyptic number.

21275223735 is a deficient number, since it is larger than the sum of its proper divisors (13770636873).

21275223735 is a wasteful number, since it uses less digits than its factorization.

21275223735 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202575.

The product of its digits is 176400, while the sum is 39.

The spelling of 21275223735 in words is "twenty-one billion, two hundred seventy-five million, two hundred twenty-three thousand, seven hundred thirty-five".