21056146436 has 24 divisors (see below), whose sum is σ = 39767757120. Its totient is φ = 9697400352.

The previous prime is 21056146429. The next prime is 21056146451. The reversal of 21056146436 is 63464165012.

It is a super-2 number, since 2×21056146436² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21056146436.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 409256 + ... + 457823.

It is an arithmetic number, because the mean of its divisors is an integer number (1656989880).

Almost surely, 2^21056146436 is an apocalyptic number.

21056146436 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21056146436 is a deficient number, since it is larger than the sum of its proper divisors (18711610684).

21056146436 is a wasteful number, since it uses less digits than its factorization.

21056146436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 867563 (or 867561 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 38.

The spelling of 21056146436 in words is "twenty-one billion, fifty-six million, one hundred forty-six thousand, four hundred thirty-six".