21331861901 has 8 divisors (see below), whose sum is σ = 24381237504. Its totient is φ = 18282978000.

The previous prime is 21331861891. The next prime is 21331861913. The reversal of 21331861901 is 10916813312.

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

It is not a de Polignac number, because 21331861901 - 2¹⁰ = 21331860877 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 (21331861921) 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, 24725 + ... + 208026.

It is an arithmetic number, because the mean of its divisors is an integer number (3047654688).

Almost surely, 2^21331861901 is an apocalyptic number.

It is an amenable number.

21331861901 is a deficient number, since it is larger than the sum of its proper divisors (3049375603).

21331861901 is a wasteful number, since it uses less digits than its factorization.

21331861901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245851.

The product of its (nonzero) digits is 7776, while the sum is 35.

The spelling of 21331861901 in words is "twenty-one billion, three hundred thirty-one million, eight hundred sixty-one thousand, nine hundred one".