21024890061 has 24 divisors (see below), whose sum is σ = 33734524320. Its totient is φ = 11599936992.

The previous prime is 21024890057. The next prime is 21024890083. The reversal of 21024890061 is 16009842012.

It is not a de Polignac number, because 21024890061 - 2² = 21024890057 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21024890011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2461711 + ... + 2470236.

It is an arithmetic number, because the mean of its divisors is an integer number (1405605180).

Almost surely, 2^21024890061 is an apocalyptic number.

21024890061 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21024890061 is a deficient number, since it is larger than the sum of its proper divisors (12709634259).

21024890061 is a wasteful number, since it uses less digits than its factorization.

21024890061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4931993 (or 4931986 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 33.

The spelling of 21024890061 in words is "twenty-one billion, twenty-four million, eight hundred ninety thousand, sixty-one".