21920985434 has 8 divisors (see below), whose sum is σ = 33438791520. Its totient is φ = 10774721596.

The previous prime is 21920985433. The next prime is 21920985469. The reversal of 21920985434 is 43458902912.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (21920985433) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 92885414 + ... + 92885649.

It is an arithmetic number, because the mean of its divisors is an integer number (4179848940).

Almost surely, 2^21920985434 is an apocalyptic number.

21920985434 is a deficient number, since it is larger than the sum of its proper divisors (11517806086).

21920985434 is a wasteful number, since it uses less digits than its factorization.

21920985434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185771124.

The product of its (nonzero) digits is 622080, while the sum is 47.

The spelling of 21920985434 in words is "twenty-one billion, nine hundred twenty million, nine hundred eighty-five thousand, four hundred thirty-four".