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21457765426 = 273607145759
BaseRepresentation
bin10011111110111110…
…111000010000110010
32001101102120102110211
4103332332320100302
5322421141443201
613505122214334
71356512665606
oct237676702062
961342512424
1021457765426
119111392839
1241aa1b43aa
13203c700226
141077b53506
15858c21651
hex4fefb8432

21457765426 has 8 divisors (see below), whose sum is σ = 32187306240. Its totient is φ = 10728663348.

The previous prime is 21457765421. The next prime is 21457765531. The reversal of 21457765426 is 62456775412.

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

It is a super-2 number, since 2×214577654262 (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21457765426.

It is not an unprimeable number, because it can be changed into a prime (21457765421) 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, 74335 + ... + 220093.

It is an arithmetic number, because the mean of its divisors is an integer number (4023413280).

Almost surely, 221457765426 is an apocalyptic number.

21457765426 is a deficient number, since it is larger than the sum of its proper divisors (10729540814).

21457765426 is a wasteful number, since it uses less digits than its factorization.

21457765426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219368.

The product of its digits is 2822400, while the sum is 49.

The spelling of 21457765426 in words is "twenty-one billion, four hundred fifty-seven million, seven hundred sixty-five thousand, four hundred twenty-six".

Divisors: 1 2 73607 145759 147214 291518 10728882713 21457765426