21235346421633 has 6 divisors (see below), whose sum is σ = 30673278164594. Its totient is φ = 14156897614416.

The previous prime is 21235346421631. The next prime is 21235346421659. The reversal of 21235346421633 is 33612464353212.

21235346421633 is a `hidden beast` number, since 2 + 1 + 2 + 3 + 5 + 3 + 4 + 6 + 4 + 2 + 1 + 633 = 666.

It can be written as a sum of positive squares in only one way, i.e., 16683238278144 + 4552108143489 = 4084512^2 + 2133567^2 .

It is not a de Polignac number, because 21235346421633 - 2¹ = 21235346421631 is a prime.

It is a super-2 number, since 2×21235346421633² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21235346421631) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1179741467860 + ... + 1179741467877.

Almost surely, 2^{21235346421633} is an apocalyptic number.

It is an amenable number.

21235346421633 is a deficient number, since it is larger than the sum of its proper divisors (9437931742961).

21235346421633 is a wasteful number, since it uses less digits than its factorization.

21235346421633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2359482935743 (or 2359482935740 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 45.

The spelling of 21235346421633 in words is "twenty-one trillion, two hundred thirty-five billion, three hundred forty-six million, four hundred twenty-one thousand, six hundred thirty-three".