Search a number
BaseRepresentation
bin10100011101100000…
…101000110011100000
32002201010022011020020
4110131200220303200
5324443300301423
614032015513440
71405302223251
oct243540506340
962633264206
1021969931488
1193544a977a
124311828880
1320c1854a7b
1410c5b94b28
15888b8e4e3
hex51d828ce0

21969931488 has 48 divisors (see below), whose sum is σ = 57680937216. Its totient is φ = 7322057600.

The previous prime is 21969931469. The next prime is 21969931519. The reversal of 21969931488 is 88413996912.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 670495 + ... + 702497.

It is an arithmetic number, because the mean of its divisors is an integer number (1201686192).

Almost surely, 221969931488 is an apocalyptic number.

It is an amenable number.

21969931488 is an abundant number, since it is smaller than the sum of its proper divisors (35711005728).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21969931488 is a wasteful number, since it uses less digits than its factorization.

21969931488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39167 (or 39159 counting only the distinct ones).

The product of its digits is 6718464, while the sum is 60.

The spelling of 21969931488 in words is "twenty-one billion, nine hundred sixty-nine million, nine hundred thirty-one thousand, four hundred eighty-eight".