21435456156 has 24 divisors (see below), whose sum is σ = 50019313680. Its totient is φ = 7144687872.

The previous prime is 21435456151. The next prime is 21435456173. The reversal of 21435456156 is 65165453412.

It is a super-3 number, since 3×21435456156³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21435456151) 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, 170340 + ... + 268116.

It is an arithmetic number, because the mean of its divisors is an integer number (2084138070).

Almost surely, 2^21435456156 is an apocalyptic number.

It is an amenable number.

21435456156 is an abundant number, since it is smaller than the sum of its proper divisors (28583857524).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21435456156 is a wasteful number, since it uses less digits than its factorization.

21435456156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116053 (or 116051 counting only the distinct ones).

The product of its digits is 432000, while the sum is 42.

It can be divided in two parts, 2143545 and 6156, that added together give a triangular number (2149701 = T₂₀₇₃).

The spelling of 21435456156 in words is "twenty-one billion, four hundred thirty-five million, four hundred fifty-six thousand, one hundred fifty-six".