21892089981 has 16 divisors (see below), whose sum is σ = 30625008128. Its totient is φ = 13892385600.

The previous prime is 21892089907. The next prime is 21892090009. The reversal of 21892089981 is 18998029812.

It is not a de Polignac number, because 21892089981 - 2¹⁴ = 21892073597 is a prime.

It is a super-2 number, since 2×21892089981² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21892089481) 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 15 ways as a sum of consecutive naturals, for example, 1923826 + ... + 1935171.

It is an arithmetic number, because the mean of its divisors is an integer number (1914063008).

Almost surely, 2^21892089981 is an apocalyptic number.

It is an amenable number.

21892089981 is a deficient number, since it is larger than the sum of its proper divisors (8732918147).

21892089981 is a wasteful number, since it uses less digits than its factorization.

21892089981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3859092.

The product of its (nonzero) digits is 1492992, while the sum is 57.

The spelling of 21892089981 in words is "twenty-one billion, eight hundred ninety-two million, eighty-nine thousand, nine hundred eighty-one".