21892697481 has 16 divisors (see below), whose sum is σ = 29667106368. Its totient is φ = 14358552000.

The previous prime is 21892697473. The next prime is 21892697509. The reversal of 21892697481 is 18479629812.

It is not a de Polignac number, because 21892697481 - 2³ = 21892697473 is a prime.

It is a super-2 number, since 2×21892697481² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21892677481) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 182535 + ... + 277676.

It is an arithmetic number, because the mean of its divisors is an integer number (1854194148).

Almost surely, 2^21892697481 is an apocalyptic number.

It is an amenable number.

21892697481 is a deficient number, since it is larger than the sum of its proper divisors (7774408887).

21892697481 is a wasteful number, since it uses less digits than its factorization.

21892697481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 460472.

The product of its digits is 3483648, while the sum is 57.

The spelling of 21892697481 in words is "twenty-one billion, eight hundred ninety-two million, six hundred ninety-seven thousand, four hundred eighty-one".