21055100562 has 24 divisors (see below), whose sum is σ = 45661012956. Its totient is φ = 7011962496.

The previous prime is 21055100557. The next prime is 21055100567. The reversal of 21055100562 is 26500155012.

It is an interprime number because it is at equal distance from previous prime (21055100557) and next prime (21055100567).

It can be written as a sum of positive squares in 2 ways, for example, as 20368712961 + 686387601 = 142719^2 + 26199^2 .

It is not an unprimeable number, because it can be changed into a prime (21055100567) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 513403 + ... + 552894.

Almost surely, 2^21055100562 is an apocalyptic number.

21055100562 is an abundant number, since it is smaller than the sum of its proper divisors (24605912394).

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

21055100562 is a wasteful number, since it uses less digits than its factorization.

21055100562 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1067402 (or 1067399 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

Adding to 21055100562 its reverse (26500155012), we get a palindrome (47555255574).

The spelling of 21055100562 in words is "twenty-one billion, fifty-five million, one hundred thousand, five hundred sixty-two".