21226053534 has 64 divisors (see below), whose sum is σ = 49781222400. Its totient is φ = 6030974880.

The previous prime is 21226053529. The next prime is 21226053553. The reversal of 21226053534 is 43535062212.

It is a happy number.

It is a super-4 number, since 4×21226053534⁴ (a number of 42 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21226053495 and 21226053504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 344007 + ... + 400989.

It is an arithmetic number, because the mean of its divisors is an integer number (777831600).

Almost surely, 2^21226053534 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21226053534, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24890611200).

21226053534 is an abundant number, since it is smaller than the sum of its proper divisors (28555168866).

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

21226053534 is a wasteful number, since it uses less digits than its factorization.

21226053534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57190 (or 57176 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 33.

The spelling of 21226053534 in words is "twenty-one billion, two hundred twenty-six million, fifty-three thousand, five hundred thirty-four".