21025733861 has 8 divisors (see below), whose sum is σ = 22939218624. Its totient is φ = 19112591520.

The previous prime is 21025733837. The next prime is 21025733863. The reversal of 21025733861 is 16833752012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21025733861 - 2¹⁰ = 21025732837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21025733863) 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, 52481 + ... + 211673.

It is an arithmetic number, because the mean of its divisors is an integer number (2867402328).

Almost surely, 2^21025733861 is an apocalyptic number.

It is an amenable number.

21025733861 is a deficient number, since it is larger than the sum of its proper divisors (1913484763).

21025733861 is a wasteful number, since it uses less digits than its factorization.

21025733861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171211.

The product of its (nonzero) digits is 60480, while the sum is 38.

The spelling of 21025733861 in words is "twenty-one billion, twenty-five million, seven hundred thirty-three thousand, eight hundred sixty-one".